Juicy Crimes with Heather McDonald

Episode: Matt Murphy On The Kouri Richins Case. Did She Poison Her Husband?

Published: March 4, 2026
Guest: Matt Murphy (former prosecutor, legal commentator, author)

Episode Overview

In this lively and revealing episode, Heather McDonald welcomes recurring favorite Matt Murphy to discuss the most compelling true crime stories currently in the headlines, with a focus on the Kouri Richins trial, the Nancy Guthrie disappearance, and wider issues of law enforcement, legal strategy, and public safety. The pair’s tone is conversational and darkly humorous while remaining empathetic to victims, offering sharp legal analysis plus plenty of “juicy” details. Notable, too, is their candid take on systemic flaws in criminal justice and the often bizarre stories behind infamous cases.

Key Discussion Points & Insights

1. The Nancy Guthrie Disappearance & Law Enforcement Critique

• [00:24–14:06]
  • Savannah Guthrie’s public plea and $1 million reward for information about her missing mother, Nancy Guthrie, spurs a deep dive into the case’s strange handling.
  • Matt Murphy expresses skepticism about Pima County law enforcement's competence and transparency:
    • “That guy is not ready for primetime… The DA...has been a ghost in this whole thing. And if you want to do this right, you need the prosecutorial authority involved.” (06:24)
  • Analysis of jurisdictional tensions between local police, FBI, and DA; claims of performative SWAT arrests and “a clown show” in the investigation (08:05–09:59).
  • Murphy provides context from his own history working high-profile, multidisciplinary cases, highlighting the way effective collaborations should work.

Notable Quotes:

• “You don’t feud with the FBI when they come in to help...I don’t know who’s running the ship.” — Matt Murphy [10:19]
• “If you have nothing to do with this, and the SWAT team rolls out...you have a civil suit there.” — Matt Murphy [09:49]

2. Analysis & Theories Around Nancy Guthrie’s Fate

• [10:11–14:06]
  • Murphy speculates on likely scenarios: sexual assault, serial killer, or other forms of foul play.
  • Deconstructs misleading elements in media and official statements—especially regarding forensic evidence like the gloves discovered near the scene.
  • Suggests there are too many conflicting statements and a lack of clear leadership.

Notable Quotes:

• “I’ve always believed that she was dead inside the house. And again, I hope I'm wrong...you exponentially increase your risk of getting caught by trying to move a body like that.” — Matt Murphy [12:49]

3. Deep Dive: The Kouri Richins Case

• [14:06–44:54]

Case Overview

• Utah real estate agent Kouri Richins accused of poisoning her husband with a fentanyl-laced Moscow Mule in March 2022.
• Couple had marital strife, affairs, business woes, and three young sons.

Prosecution’s Evidence

• Financial motives: $4 million in debt, new life insurance policies, and embezzlement from husband’s business.
• Multiple alleged attempts to poison, including sourcing opioids from a housekeeper with a criminal record.
• Damning text messages and “Walk the Dog” letter instructing witness tampering.
• Suspect behavior: taking a vacation and celebrating a real estate deal immediately after husband’s death.

Defense’s Claims

• Husband possibly overdosed on street drugs recreationally.
• Marital infidelity and financial struggle are not evidence of murder.

Expert Opinions

• Murphy draws parallels to his Bill McLaughlin and Nanette Johnston case:
  • “This is really similar to [McLaughlin]: young pretty woman, older rich guy, affair, money problems, and a murder.” [17:20]
• Murphy on motive and practical details:
  • “When you’re innocent, the truth is your best friend. If the truth is you didn’t do it, the truth is your best friend.” [40:23]
• Predicts conviction: “My prediction is she's going down.” [37:45]

Memorable Moments

• Richins wrote a children’s book about grief after her husband’s death, then promoted it on TV before arrest. [23:27]
• Fights with deceased husband’s sister over assets after discovering she was excluded from inheritance. (29:51–30:17)
• “If she would just keep her mouth shut, she’d be in a lot better position.” — Matt Murphy on Kouri Richins [31:00]
• The “Walk the Dog” letter: instructions for tampering with brother’s testimony and targeting relatives online. [32:11–33:13]
• Discussion of mother’s boyfriend’s suspicious opiate-related death, echoing the daughter’s case. [33:23]

4. Other Notable Crime Updates

• Other Domestic Homicides:
  • Case of a pastor whose wife was found shot in the head; police rapidly arrest the husband, with rumors of a church affair and legal commentary on motivations and statistics. [44:54–48:48]
  • “It’s almost 50% of the time they’re killed by an intimate partner…there’s a reason why police look at spouses first.” — Matt Murphy [45:14]
• Costa Rica Surfer Murder:
  • Unusual circumstances suggest possible girlfriend involvement, analogy to other international true crime stories. [48:49–51:55]
• Analysis on the Survivor Producer Case:
  • Critique of implausible vacation alibi and the value of “common sense” in homicide investigations. [51:55–53:49]

5. Media, Journalism, and True Crime Culture

• [53:49–56:47]
  • The complex role of citizen investigators, journalists, and online “detectives” in publicizing cases like Epstein and others.
  • Barriers to bringing exposés to light due to influential connections (e.g., Jay Shetty, Vanity Fair’s spiked Epstein article).
  • Reflection on why celebrity scandals often remain unspoken in major entertainment outlets.

Notable Quotes:

• “The experts are those of us who’ve lived life and had relationships and we understand human behavior…at the end of the day, they [cases] all boil down to common sense.” — Matt Murphy [52:19]

6. Sexual Predators, Parole, and the Law

• [60:48–68:14]
  • Murphy launches into an impassioned critique of California’s laws allowing early parole opportunities for even the most dangerous sex offenders.
  • Tells personal stories of serial rapists and child molesters released, reoffending, and the failures of “compassionate release.”
  • Argues for realistic, tough-on-crime laws: “There’s no fixing them. They are going to continue to do it. I’ve seen it over and over.” [67:29]
  • Discusses the concept of "green worms in the brain" as the only explanation for predatory repeat behavior and debunks the idea of “model prisoners” as evidence of rehabilitation.
  • Comparison to vigilante justice in under-policed countries—warns that systemic failures will have grave consequences.

7. A Positive Ending: Amber Alert Success

• [68:14–71:22]
  • Uplifting account of movers trained to spot human trafficking who successfully rescued a kidnapped child thanks to attentiveness and quick action.
  • “We shouldn’t have to rely on heroes...There needs to be adults in the room when we pass laws.” — Matt Murphy [70:03]

8. Matt Murphy’s Closing Updates

• [71:22–74:45]
  • Announces upcoming podcast with famed defense attorney Mark Geragos: a “case of the day” format from prosecutor vs. defense perspectives.
  • Working on his second true crime book (first optioned by HBO).
  • Candid about the real-life collegiality and professionalism between “rival” lawyers: “He’s a really good dude… He’s got a big heart.” [71:49–73:02]

Notable Quotes & Timestamps

• “You don’t feud with the FBI when they come in to help...” — Matt Murphy [10:19]
• “If you have nothing to do with this, and the SWAT team rolls out...you have a civil suit there.” — Matt Murphy [09:49]
• “When you’re innocent, the truth is your best friend.” — Matt Murphy [40:23]
• “My prediction is she’s going down.” — Matt Murphy [37:45]
• “The experts are those of us who’ve lived life and had relationships and we understand human behavior… at the end of the day, they all boil down to common sense.” — Matt Murphy [52:19]
• “There’s no fixing them. They are going to continue to do it. I’ve seen it over and over.” — Matt Murphy on sexual predators [67:29]
• “We shouldn't have to rely on heroes like those guys to save that little girl...there needs to be adults in the room when we pass laws like this.” — Matt Murphy [70:03]

Episode Highlights by Timestamp

• 00:24–14:06: Guthrie disappearance case and law enforcement critique
• 14:06–44:54: Detailed analysis of Kouri Richins trial—motive, evidence, legal strategies
• 44:54–48:48: Domestic homicide cases; statistics about women murdered by partners
• 48:49–51:55: International crimes (Costa Rica surfer, Survivor producer)
• 53:49–56:47: Journalism, media silence, Epstein files, the culture of exposé
• 60:48–68:14: Dangers of sex offender parole laws; personal stories and legal reform
• 68:14–71:22: Good news: Amber alert recovery by vigilant movers
• 71:22–74:45: Murphy’s new projects, reflections on true crime commentary

Tone & Style

• Original Tone: Wry, candid, at times darkly comedic; expertly blends legal education, empathy for victims, and a “no-BS” view of the justice system.
• Dynamic: Murphy provides legal expertise and personal experience; Heather guides with practical questions and cultural observations, keeping the discussion accessible and lively.

Summary Takeaway

This episode offers a captivating blend of headline true crime updates, expert legal insight, and critique of systemic failures, with Matt Murphy providing unfiltered, hard-won perspectives. Listeners are taken through complex cases—especially Kouri Richins’ gripping, twist-laden trial—while exploring broader truths about human behavior, the criminal justice system, and the persistent challenges in preventing and punishing egregious crimes.

For more updates, follow Heather McDonald and Matt Murphy, and watch for the upcoming Murphy-Geragos “case of the day” podcast.