DNA: ID, Episode Summary

Episode: Doe ID: Donna Lass

Host: Jessica Bettencourt
Date: March 16, 2026
Podcast Network: AbJack Entertainment

Overview

This episode of DNA: ID dives into the decades-long disappearance and recent identification of Donna Lass, a nurse who vanished in South Lake Tahoe, California, in 1970. The case, infamous both for its Zodiac Killer connections and persistent cold status, was finally provided resolution in 2023 through investigative genetic genealogy (IGG), which matched unidentified remains found in 1986 to Lass. The episode explores the details behind Donna’s life, disappearance, the investigation’s trajectory, speculative links to the Zodiac, the discovery and identification of her remains, and continuing unanswered questions about her fate.

Key Discussion Points & Insights

Discovery of Remains and Initial Confusion (01:58–06:30)

• Opening Quote: Jessica begins with a 1986 newspaper clipping describing skeletal remains found near Yuba Gap, California, but states much in the early reporting is inconsistent with case files.
• Forensic Details:
  • In August 1986, a human skull was found in California’s Sierra Nevada, near Lake Spalding (not the originally reported location).
  • The skull showed sun and rodent damage, and its location suggested it may have washed down from somewhere else due to melting snow.
  • Early pathology could not determine age or sex; later analysis clarified it belonged to a white female, mid-teens to mid-twenties, dead for at least 2–3 years at the time of discovery.
  • Local authorities in the 1980s were unable to make an identification with the tools available, and the case went cold.

Quote:
"A pathologist examined the skull and wasn't able to determine the age or sex of the victim. Later analysis determined that the skull belonged to a white female in her mid teens to mid twenties."
— Jessica Bettencourt (05:10)

The Lass Family & Donna’s Life (06:31–13:00)

• Background: Donna Ann Lass grew up in a close South Dakota family, youngest of eight siblings; described as adventurous yet cautious.
• Career Path:
  • Trained as a nurse, she worked in multiple cities and moved to South Lake Tahoe in 1970, taking jobs at the Sahara Tahoe Casino as both a nurse and photographer.
  • Friends characterized her as reliable, reserved, and somewhat anxious about being alone at night.

Quote:
"She was someone who always wanted a friend with her... Despite being adventurous, was a bit of a scaredy cat and was afraid of the dark."
— Jessica Bettencourt (09:10)

Donna's Disappearance (13:01–20:51)

• Events Preceding Disappearance:

  • Last seen by her apartment manager on September 5, 1970, at noon.
  • Worked a 6pm–2am shift at the Sahara Tahoe Casino (September 5–6).
  • She was excited for a date after work and likely changed from her nurse’s uniform into civilian clothes before leaving (locker content reference, 12:31).
  • There is confusion over whether her last logbook entry was at 10:35pm or if she signed out later; none of the logbook entries match her handwriting for the night she disappeared.

• Discovery of Absence:

  • Her friend Joanne expected to meet Donna and, unable to find her, waited in South Lake Tahoe but never heard from her again.
  • The casino and her apartment manager received a phone call from a man claiming to be her landlord, stating she was leaving due to a family illness—this was false and likely meant to distract or delay concerns (15:10).
  • After almost two weeks, her family was notified and traveled to California to investigate.

Quote:
"These calls are believed to have been placed by someone who wanted to ensure that no one was looking for Donna by providing an explanation for her absence."
— Jessica Bettencourt (14:30)

The Investigation and Family Efforts (20:52–26:13)

• Initial Police Actions: Donna’s apartment was searched; all possessions in place except for one outfit and her purse (19:30).
• Family Advocacy: Her sisters, especially Mary Pilker, pushed for more thorough investigation and reached out to the FBI and elected officials, who responded that they had no jurisdiction.
• Police Theories: Despite her responsible nature, local law enforcement was slow to consider foul play; the first formal missing person reports occurred weeks after her disappearance.

Quote:
"Mary quickly became unhappy with the pace, scope, and commitment of the investigation... she bugged the South Lake Tahoe police lieutenant in charge of the missing person's case on a daily basis."
— Jessica Bettencourt (20:04)

The Zodiac Killer Connection and Publicity (26:14–32:50)

• The 1971 Zodiac Postcard:
  • In March 1971, the San Francisco Chronicle received a postcard (addressed to reporter Paul Avery) believed to be from the Zodiac, alluding to a victim near Lake Tahoe, “buried under the snow” (26:30).
  • The postcard didn’t name Donna but referenced a missing woman and “victim 12.” Since Donna’s case was high-profile, investigators speculated she was referenced.
  • Experts confirmed the handwriting as Zodiac’s; however, there were multiple false confessions and admitted hoaxes linked to this correspondence.
• Family’s Perspective: Family initially doubted Zodiac involvement but later considered it plausible.
• Follow-Up: In 1974, an anonymous Christmas card was sent to Donna’s sister, referencing “St. Donna and Guardian of the Pines”—contents never decoded (31:00).

Quote:
"There has been speculation about Lass being connected to the Zodiac case, but there has not been a definitive evidence-based connection to support that. Having said that, we're exploring all possibilities."
— Sgt. Nick Carlquist (38:24)

Decades of Cold Case and Renewed Efforts (32:51–38:10)

• Searches Based on Zodiac Clues: In 2007, authorities followed tips informed by the Zodiac postcard but found nothing.
• How Donna Was Ultimately Identified:
  • In 2023, applying IGG to the skull found in 1986 yielded a match to Lass through a first-degree relative.
  • Donna’s family, some of whom had submitted DNA years earlier, were finally notified.
  • Her remains were found about 70 miles from South Lake Tahoe; the location did not match any Zodiac-referenced sites.
• Ongoing Investigation: Donna’s case remains open, classified as suspicious but not officially as a homicide. No definitive suspect has been identified.

Quote:
"It hasn't been proven to be a homicide at this point, but we're obviously treating it that way."
— Chief David Stevenson (37:45)

Notable Quotes & Memorable Moments

• On Misreporting:
  "I'm here to tell you that we just don't know if any of that is correct or if it even pertains to this case. The case files reflect something quite different..."
  — Jessica Bettencourt (01:58)

• On the Family's Endurance:
  "The family is grateful for a bit of closure."
  — Chief David Stevenson (36:50)

• On Case Uncertainty:
  "We get as many as 20 tips daily. Everything from Donna Lass was taken by aliens to she's with Jimmy Hoffa, to many very plausible theories that are impossible to prove with such sparse evidence, spotty documentation, and the passing of more than a half century."
  — Sgt. Nick Carlquist (38:05)

Timestamps for Important Segments

• 01:58: Introduction of case and discovery of skull
• 05:10: Forensic overview of the recovered skull
• 06:31: Donna Lass’s family and background
• 12:31: Discovery that Donna’s uniform was left at workplace
• 13:01: Timeline of last known sightings
• 14:30: Discussion of false phone call to Donna’s workplace
• 15:50: Family’s response and push for investigation
• 26:30: 1971 Zodiac postcard and onset of media attention
• 31:00: Reference to the mysterious Christmas card to Donna’s sister
• 32:51: Multiple search attempts in response to Zodiac clues
• 35:00: 2023 DNA identification of remains and notification of family
• 37:45: Current investigative status and open questions
• 38:24: Sgt. Carlquist on the Zodiac speculation

Flow, Tone, and Takeaways

Jessica Bettencourt narrates the episode with clarity and empathy, expressing the frustration and heartbreak of the Lass family while methodically deconstructing myths and misinformation that have clouded Donna’s case for decades. The tone is respectful and diligent, particularly as the episode transitions from speculation about the Zodiac to the facts established by genetic genealogy.

The episode ultimately leaves the listener with a sense of closure for the Lass family in having Donna identified, but underscores the persistent mystery of who killed her and why, highlighting the limitations of even the latest investigative techniques when evidence is sparse and historical record-keeping was lacking.

Conclusion

Donna Lass’s story, as detailed in this episode, exemplifies both the heartbreak of unresolved cases and the power of modern forensic genealogy to finally provide answers. The episode carefully dismantles decades of rumors and speculative connections to the Zodiac while honoring Donna’s legacy and the relentless advocacy of her family. The case remains unsolved, but the establishment of her identity is a significant and long-awaited step.