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Carter Roy (4:50)

In the wee hours of the morning on June 10, 1968, New York State Troopers David Fleming and Ronald Amu were dispatched to a rest area near Dewolf Point State park on Wellesley Island. It was the worst kind of call to get in the middle of the night. There had been a murder. When the two troopers got to the scene of the crime, the only person they saw was one of their own, Trooper David Hennigan, kneeling beside a body in a rocky ravine. His uniform was bloodstained, but there was also a small spot of blood on the bumper of Hannigan's dark blue unmarked police car. The dead woman was 25 year old schoolteacher Irene Isaac. She had been bludgeoned in the back of the head with extreme force. A look of terror was still visible on Irene's face. One of the officers took note of Irene's blood on Trooper Hennigan's uniform and asked Hennigan how it had gotten there. Hennigan said he found Irene face down and rolled her onto her back to see if she was still alive. But police procedures at the time called for officers to check for signs of life only with great care to avoid disturbing evidence. So right off the bat, the crime scene was somewhat compromised. Additionally Hennigan had taken several different routes as he moved around Irene's body, trampling vegetation as he did so. As other state troopers arrived, they followed Hennigan's lead and did the same. By the time investigator Raymond Paulett arrived, the crime scene was irrevocably contaminated. Besides the damage to the landscape, something else about the crime scene stood out to Paulett. Later he spoke to journalist and private investigator Dave Champine about the crime scene. Even with the vegetation trampled down, Irene's body was quite difficult to see. It was hard for Paulette to imagine Hennigan spotting her from the top of the overgrown ravine with just his flashlight. And if he didn't see the body from above, then why did he climb down into the ditch? This all seemed strange, but the state troopers knew it was too early to zero in on a single suspect, especially with only circumstantial evidence. And there was an urgent reason to cast a wide net. If the killer wasn't Hannigan, they might still be on the island. If so, they were certainly trying to escape. Wellesley island is only about 8 1/2 miles long. Only one road, Interstate 81 can get you on and off. Driving south to the New York State mainland requires passing a toll booth. Taking i81 to the north means passing through Canadian border security. Unless the perpetrator left the island by boat, someone at border security would have seen them driving off. With that in mind, investigators closed the Canadian border crossing on the northern side of the island. After arriving at the scene, trooper AMU drove his car back to the southern crossing and closed that side to traffic too. Meanwhile, the Coast Guard was summoned to search for suspicious boats in the area and troopers on foot began canvassing the few permanent homes on Wellesley Island. Irene and Hennegan were both seen at the tollbooth on the American side of the island less than 30 minutes before the troopers 2:35am radio call. So she couldn't have been dead for long. Still, the killer might have left the scene and driven straight off the island before the two crossings were closed. That would require interacting with Canadian customs officials to the north or with a toll collector on the American side without arousing any suspicion. It's hard to imagine someone appearing clean and composed at a border crossing right after beating a woman to death. But it's certainly possible the killer might have had a change of clothes or someone else to drive their vehicle. Those must have been some of the thoughts running through the state troopers minds as they marshaled their resources for an all out search. It was a small island with few permanent residents. Surely someone had seen something. Meanwhile, Trooper Hannigan was briefly interviewed by recently promoted Troop Commander Raymond Rasmussen, who noticed Hennigan seemed very nervous. Yet after this interview, Hannigan was allowed to leave the scene. The police also lost track of another crucial component of their investigation. Multiple officers had reported seeing what appeared to be a spot of blood on the bumper of Hennigan's car, presumably Irene's. But by the time investigators saw his vehicle again, the spot had vanished. Whether that was due to rainy weather or something more nefarious, we'll probably never know. But as suspicious as it all seemed, there were rational explanations for everything, too. Investigator Raymond Paulette thought Hannigan might have flipped Irene's body over as a reactive, according to his conversations with the journalist who covered the case for years, Dave Champine. Even Commander Rasmussen, who spoke to Hennigan at the scene later said he wrote off Hennigan's nerves as a reaction to the new troop commander. So it made sense to cast as wide of a net as possible in the search for potential suspects. While Hennigan's colleagues were searching for somebody, anybody else who might have killed Irene, Isaac Trooper Hennigan was figuring out his next move.

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Carter Roy (11:53)

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Carter Roy (13:11)

Apply details@dsw.com June 10, 1968 was a very long day for State Trooper David Hennigan. After reporting Irene Isaac's murder at 2:35am he was questioned at the scene by his commander. Then he met with another authority figure, Jefferson County District attorney William J. McCluskey. Law and order was quite literally in District Attorney McCluskey's blood. It would take more than one episode of this podcast to list the names of all his relatives who were lawyers, judges and cops named McCluskey in upstate New York. There was even another William McCluskey in the family who was elected to the New York State Supreme Court. At some point on the day of the murder, investigators had Trooper Hennigan drive them around Wellesley island, retracing his route from that morning, District Attorney McCluskey decided to ride along, which gave Hennigan an opportunity to ask for some legal advice. The Bureau of Criminal Investigation wanted him to take a lie detector test. Hannigan asked DA McCluskey if he should do it. McCluskey said that he would take the test if he was in Hennigan's position, but advised Hennigan to speak with an attorney first. Hennigan took his advice. In part, it doesn't seem like Hennigan talked to any other lawyers, but at some point after retracing his movements by car, Hennigan reported to the Alexandria base station for a polygraph test. The results were inconclusive, possibly because by the time the polygraph was conducted, Hennigan had been awake for more than 30 hours straight, although he didn't seem all that tired despite his lack of sleep. While he was at the Alexandria base station, Trooper Hennigan became so tense that he couldn't sit still. He got up during questioning and began running in place. When asked what he was doing, Hennigan responded that he needed to get rid of excess energy after such a long day, Trooper Hannigan was allowed to go home and rest. Remember, he was not under arrest, but he was still under investigation. In the coming days, investigators Charles Donahue and Raymond Paulette found some glaring problems with Hennegan's story. First and foremost, investigators had driven Irene's car and confirmed it couldn't go fast enough to be stopped for speeding. Secondly, it struck Donahue as peculiar that Hennigan claimed he didn't recognize Irene's vehicle when he first saw it at the rest stop. It seemed unlikely that Hennigan would have forgotten about the only vehicle he pulled over during his shift less than 30 minutes earlier. Thirdly, and perhaps most tellingly, Hennigan told multiple stories about how Irene's blood got on his uniform. First, he claimed he'd seen vapors coming from her mouth that suggested she might still be breathing, which led him to turn her body over and check for signs of life. Then he said he was running down the hill towards the body, tripped and fell onto Irene's corpse. The third version of his story was even more strange. He claimed that as he turned Irene's body over, her hair somehow flopped around in a way that splattered his uniform with blood. It was high time to question Trooper Hennigan. More formally. The Bureau of Criminal Investigation, or bci, hatched a plan. They'd wait until he reported to the Watertown station for his usual night shift. Then his commanding officer would order him to report to the station in Oneida. Instead, BCI investigators would meet him and question him there. The idea was to catch Hennigan off guard. If he didn't know he was going to be questioned that night, he probably wouldn't show up. With a lawyer and a well rehearsed answer for every question the investigators asked. And according to investigator Raymond Paulette, the plan worked, at least initially. He recalled that Hannigan first stuck to his story. He'd found the body, but he wasn't involved in the murder. But Paulette was an experienced investigator, and he felt that Hannigan was edging closer to making an admission. All they had to do was keep pressing him and the truth would come out. That might have happened if it weren't for Mrs. Hennigan. The trooper's wife somehow found out her husband was being interrogated without a lawyer present. She drove to the station, barged into the interview room, and demanded that the investigators either arrest her husband or release him. Trooper Hennigan clammed up and was never formally interviewed by police again in connection with Irene Isaac's murder. As damning as this sounds, it's still possible to see things from another perspective. Tricking someone into being interrogated without an attorney present isn't exactly respecting the right to counsel. And through a modern lens, we now know that extended high pressure questioning can lead to false confessions. Furthermore, polygraph testing was standard police procedure in 1968, but it's no longer considered reliable. And like we mentioned in part one, Hennigan passed a second polygraph test conducted on June 20th. District Attorney McCluskey pointed out that all the evidence was circumstantial. Still, the basic facts of the case remained. Hannigan found Irene's well concealed body with alarming speed at the bottom of a steep, overgrown ravine. Her blood was on him and he didn't have a consistent explanation for why. He'd also contaminated the crime scene and allowed others to do the same. On top of that, other aspects of his story kept changing. After claiming he stopped Irene for speeding, Hennigan learned her car wasn't even capable of going that fast. He then claimed he'd pulled Irene's Volkswagen over for a, quote, routine check due to nearby burglaries. It was all very suspicious. But with Hannigan no longer willing to talk, options were limited. It would be tough to get an indictment, much less a conviction. Pretty soon, Hannigan was back on the job. The state police decided not to suspend or discipline him for his violations of police procedure at the crime SC scene. But that didn't mean the investigation was over. With Hennigan all but ruled out as a suspect, investigator Raymond Paulette turned to alternate theories. The search for other suspects was far reaching and thorough. Irene's friends and family were interviewed, including the ex boyfriend who'd broken her heart during her time at Laval University in Quebec. Police also looked into the few full time Wellesley island residents, but didn't find any serious leads. However, there was a chance the public could help. The high profile unsolved murder got plenty of coverage from the local Watertown Daily Times as well as Irene's hometown paper, the Scranton Times Tribune. The story even made its way into multiple true crime magazines, including the widely read True Detective. With all that coverage, tips started to come in. A 16 year old driving from Canada to Chicago, unnamed in police records, reported seeing a light colored Volkswagen Beetle pulled over at the rest stop next to another vehicle. According to the witness, the other car was shining a spotlight on the Beetle and two men were standing next to the cars chatting at the time. The witness assumed the two vehicles must have been involved in an accident and the drivers were exchanging contact information. The teenage witness claimed to have looked at their watch at 2:50am after driving about five miles past the crime scene. Unless the witness drove extremely slowly, the conversation they reported must have taken place after Irene was already dead. Or perhaps the teenager's watch was fast and what they actually saw was a confrontation between Irene and her killer. Irene had short hair and was wearing a baggy coat over her pink sweater. She could easily have been mistaken for a man by a casual observer driving by. Another witness also mentioned seeing multiple men near a light colored Volkswagen Beetle parked at the rest area around the time of Irene's death. The second statement describes three men, not two, and a second vehicle with horizontal taillights. A third member of the public says he offered the police not just a tip, but an actual piece of physical evidence. A bloody newspaper, perhaps used to wipe down the murder weapon. Joseph Rich, a TV news reporter working in Watertown, claimed in later police interviews that he went to the crime scene a few hours after the police and stumbled upon a copy of the Rochester Democrat and Chronicle with a large dark stain on it. According to Rich, he took the paper directly to the police and handed it to Troop Commander Raymond Rasmussen. When interviewed decades later, Rasmussen couldn't recall this interaction or the bloody newspaper. Rich says he followed up with the station several times, but was unable to reach anyone who could tell him what happened to the paper. He was so upset by this, he wrote a letter to the Watertown Daily Times criticizing the investigators for losing evidence. Even so, the stained paper never resurfaced. As the months ticked by and the trail grew cold, investigators cast an even Wider Net. On November 25, 1968, District Attorney William McCluskey traveled to Colorado for a meeting with Summit County Sheriff Charles Clark. Apparently, McCluskey believed two residents of Breckenridge, Colorado had been on Wellesley island when Irene was killed. One of them had been telling people he knew something about the murder. Based on police records. He may have even called in a tip about it himself. The DA's trip didn't pan out. One of the two names McCluskey gave the local sheriff didn't match anyone living in Breckenridge. And even though the other possible suspect was a local resident, it quickly became clear he was just a true crime fan. He didn't know anything about the murder that hadn't been reported in those 60s True crime magazines that had published Irene's story. I should emphasize two things about this chapter of the investigation. First, this is highly unusual behavior for a district attorney in New York. Prosecutors may take statements from defendants after they've been arrested. However, it's not typical for an elected DA to travel out of state to follow up on a telephone tip before an arrest has been made. It's Even stranger that McCluskey found the time to get so personally Involved, he was maintaining a busy private law practice on top of his work as District Attorney. It's hard to explain why he wouldn't just let the Bureau of Criminal Investigation follow up on this tip. Secondly, the fact that McCluskey traveled to Colorado, along with several other details in the story, is previously unreported. You're among the first people outside the New York State Police Department to know of it. The information comes directly from case files obtained by attorney and author Tom Riley, whose recent mystery novel Thousand Islands is inspired by Irene's murder. Riley used the Freedom of Information act to compel the New York State Police to release various records in the case in the interest of keeping Irene's memory alive. Riley was kind enough to share those case files with us. And so, after his uneventful trip to Colorado, District Attorney McCluskey returned to New York empty handed. After hundreds of hours of police work, 1968 ended with no meaningful progress made in Irene's case. By this time, the Isaac family was becoming profoundly disillusioned. Her father, Ukrainian Catholic priest Boden Isaac, began telling his family that the police quote, covered up for one of their own. In spite of his suspicions, Bowden tried repeatedly to speak with Trooper Hennigan in hopes of finding some form of closure. Guilty or innocent, he was one of the last people to see Irene alive. Hannigan never responded to Irene's father's calls or letters. Bowden even drove from Scranton to Watertown hoping to catch Trooper Hennigan on duty. No such luck. Hennigan made himself scarce whenever Bowden was around. Many of Hennigan's colleagues found this strange for two reasons. First of all, it defied law enforcement culture at the time. An officer who found a murder victim's body would typically make time to meet the victim's family if they requested it. Second, Hennigan was a fellow Catholic who had only become more religious since finding Irene's body. Bowden was a Catholic priest. Rather than treating Bowdoin with a parishioner's deference, Hennigan snubbed him completely and kept doing so for decades. But in the meantime, the investigation continued and other suspects emerged.

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Carter Roy (30:11)

The next ray of hope in Irene Isaac's case came in October 1969, 16 months after her murder, when a burglar with a mental health condition serving time in Toronto confessed to the crime. Two investigators drove to Canada and interviewed the potential suspect, Albert Cinnabert, but it was another dead end. Much like the Colorado suspect, Cinnabert couldn't tell the police anything he hadn't read in True Detective magazine. They left frustrated, having realized he just wanted a transfer to an American prison. As the years stretched on, several known serial killers were considered as potential culprits, including the infamous Ted Bundy. But they were all ruled out. Because Hannigan found the body so quickly, the approximate time of Irene's death was known. Nobody with an alibi between 2:09am and 2:35am on June 10, 1968, could possibly have been the murderer. District Attorney McCluskey moved on, leaving the prosecutor's office in 1973 to become a judge. David Hennigan remained a state trooper, but his life changed dramatically after Irene's murder. Once known as heathen among his colleagues, possibly for his habit of stealing porno magazines out of trash cans, by the early 1970s, he was dedicating most of his free time to his church. He would eventually become a deacon and pastoral assistant. Investigator Raymond Paulette stuck with the case for years and was willing to follow up on any possible leads. But his tireless search turned up empty. And then there was Irene's family. Her parents. Bowden and Maria eventually decided not to talk about their daughter anymore. When a private detective briefly took the case, he called Bowden to ask for his blessing. Bowden forcefully said he did not want the case investigated further. The PI dropped it. The rest of the family respected Bowdoin and Maria's wishes while they were alive. But by 1991, both of Irene's parents had died. That's when Lisa Caputo, Irene's niece, swung into action. At first she just wanted to know what the police knew. Lisa was only four years old when Irene was murdered. She didn't remember much about the case, so she asked for the files, expecting little resistance. After all, it had been almost 25 years and all the original investigators had long since retired. Surprisingly, the state police told her the case was still active, so she couldn't have the files. They did agree to return some of Irene's belongings to the family, though, including her class ring. But Lisa couldn't understand why her aunt's supposedly active case was barely being investigated. Lisa became determined to get justice for her aunt, especially because Lisa's mother, Helen was still alive. Growing up, sisters Helen and Irene were close. After Irene's death, Helen made the best of things, living a full life and even winning the occasional recipe contest. But Lisa saw the grief in her mother's eyes whenever something reminded her of her sister. In September 1998, with the help of a private investigator, Lisa prepared a letter to the Governor of New York. It was signed by Helen, Lisa's mother, as well as Lisa's father, Paul. The letter laid out 10 reasons Hennigan's behavior after the murder appeared suspicious enough to warrant re investigation. Specifically, the letter asked the Governor to use new forensic technologies like DNA analysis to retest the evidence gathered at the scene of Irene's murder, including Trooper Hennigan's bloody uniform. Governor George Pataki was receptive. A month later, in October, he gave the order for Irene's murder to be reinvestigated. A portion of Hennigan's uniform was sent for blood spatter analysis. Unfortunately, it didn't yield any new information, possibly because there wasn't enough of Irene's blood left on the material. The analysis did confirm that the blood was indeed Irene's, but there was never any doubt about that. Beyond Hennigan's uniform, the State Police offered to exhume Irene's body. It was a tough call. Irene died so young, nobody knew what her wishes would have been regarding her body. But ultimately the family gave the go ahead. On December 30, 1998, Irene Isaac was exhumed from the cemetery next to her father's church. The body was examined by an all star team. Leading the autopsy was Dr. Michael Baden, the New York State pathologist who had previously worked on cases including the assassination of John F. Kennedy. Assisting him was Dr. Lowell Levine, a dental expert with a list of credentials a mile long, including assisting the investigation into the assassination of the Reverend Dr. Martin Luther King Jr. By this time, all that was left to examine was Irene's skeleton. But that was enough. To these two experts, it told a clear story. Striations on Irene's skull indicated the murder weapon had a ridge on it. That meant it was most likely a man made object as opposed to something like a rock. And the most common object fitting this description is a heavy metal flashlight. We know that Trooper Hennigan used the same kind of flashlight the night of Irene's death. But like all the other evidence, this was circumstantial. However, these findings were significant enough that in 1999, the investigators working on round two of Irene's case desperately wanted to speak with Trooper Hennigan. By this time, Hennigan was retired from the state police and spending nearly all his time at church. He was as close as a layperson can get to being a priest, even helping conduct ceremonies to celebrate Mass. Seven police officers in three vehicles laid a trap for Hennigan on I81, ironically, the same highway Irene was driving the night of her murder. They pulled him over, then approached him as a group, asking him to come to a nearby motel and answer a few questions. It must have been an intimidating experience for Hennigan. But it wasn't enough to change his mind about discussing the case. He flatly refused to go to the motel. Investigators were left with no choice but to let their only suspect go again. The current district attorney felt there still wasn't enough evidence to arrest and try him. Continuing to follow him around and ask him to come in for questioning likely would have been seen as harassment. Lisa Caputo and other members of Irene's family tried appealing to Hennigan in letters, but he uniformly ignored them, just like he ignored Irene's father. The only person connected to the case who ever got a real reply from retired Trooper Hannigan was Dave Champine, the journalist who wrote the north country murder of Irene Isaac stained by her blood. In August 2004, Hennigan responded to one of Champagne's letters by insulting Dave's writing and threatening him with a lawsuit. In 2009, David Hennigan died of heart disease. He was preceded in death five years earlier by former district attorney and retired judge William McCluskey. Irene's sister Helen celebrated her 50th wedding anniversary in 2010. She still mourns Irene and still believes Trooper Hannigan killed her. As for Lisa Caputo, the intrepid niece who reopened her aunt's case, she's still on the job. She gives interviews about Irene, every chant she gets, hoping that keeping her name in the news will eventually jog someone's memory, maybe even turn up a new piece of evidence big enough to bring her family closure. Helping to keep Lisa's hope alive is her newfound ally, the mystery writer and attorney Tom Riley. After convincing the New York State Police to share their case files, Riley has turned his attention to the second government agency still holding unreleased files about Irene's death, Jefferson County, New York. Unfortunately, Jefferson county claims to have destroyed most of their physical documents related to Irene's murder. As for electronic documents, the few emails Jefferson county provided to Riley were redacted almost in their entirety. There wasn't even enough information visible to confirm the messages were about Irene's case. It's on all of us to make sure Irene Isaac gets the justice she so desperately deserves. The more we keep telling and sharing her story, the more likely it is that new evidence will someday emerge. If you or someone you know has any information that could help put Irene's case to rest once and for all, please call the Watertown Police Department at 617-972-6500 or fill out the tip line form linked in our show Notes it might be too late to prosecute Irene's killer, but there's still time to give her surviving family members the answers they've been waiting 56 years for. Thanks so much for listening. I'm Carter Roy and this is Murder True Crime Stories. Come back next week for the story of a new murder and all the people it affected. Special thanks once again to Tom Riley for his assistance in report reporting this episode. Without the case files he generously shared with our team, we wouldn't have been able to tell this story with the same degree of thoroughness and care. You'll find a link in the show Notes to Thousand Islands, Tom Riley's new novel based on Irene's real life murder. True Crime Stories is a Crime House original powered by Pave Studios. Here at Crime House, we want to thank each and every one of you for your support. If you like what you heard today, reach out on social media True Crime Pod on Instagram, TikTok, Facebook and YouTube. Don't forget to rate, review and follow Murder True Crime Stories. Wherever you get your podcasts, your feedback truly makes a difference. We'll be back next Tuesday. True Crime Stories, a Crime House original is executive produced by Max Cutler. This episode of True Crime Stories was sound designed by Ron Shapiro, written by Jelena War, edited by Natalie Perzapski, fact checked by Katherine Barner and included production assistance from Kristen Acevedo and Sarah Carroll. Murder True Crime Stories is hosted by Carter Roy. You may know a serial killer's crimes, now uncover the psychology behind them. Mind of a Serial Killer is a crime house. Original new episodes drop every Monday. Just search Mind of a Serial Killer and follow wherever you listen to podcasts.