INVESTIGATIVE CASE DOSSIER: MARY SILVANI MURDER: HOW DNA DOE PROJECT & IDENTIFINDERS SOLVED LAKE TAHOE COLD CASE
- Victim: Mary Edith Silvani (33 years old; Pontiac, Michigan)
- Date of Crime: Discovered July 17, 1982
- Location: Sheep’s Flat, Mount Rose Highway, Washoe County, Nevada
- Perpetrator: James Richard Seymour (Convicted serial rapist; deceased 1993)
- Forensic Organizations: Washoe County Sheriff’s Office, DNA Doe Project, Identifinders International
- Dual Resolution: May 2019 (Identified both the victim and her killer via Genetic Genealogy)
- Case Status: Solved & Cleared (2019)
On July 17, 1982, hikers walking near Sheep’s Flat along the Mount Rose Highway overlooking Lake Tahoe in Washoe County, Nevada, discovered the body of an unidentified young woman. She had suffered a fatal gunshot wound to the back of the head and sexual assault. For thirty-seven years, she was known simply as ‘Sheep’s Flat Jane Doe’. In May 2019, the Washoe County Sheriff’s Office, in partnership with the DNA Doe Project and Identifinders International, made worldwide forensic history by using investigative genetic genealogy to solve both mysteries simultaneously: identifying the victim as thirty-three-year-old Mary Edith Silvani and her killer as deceased serial predator James Richard Seymour.
The 1982 Lake Tahoe Discovery & Scene Reconstruction
On July 17, 1982, two hikers walking through Sheep’s Flat—a popular recreational area off Nevada State Route 431 overlooking Lake Tahoe—spotted human remains partially concealed behind a large granite boulder. Washoe County Sheriff’s detectives processed the scene.
The victim had been shot once in the back of the head with a .22 caliber firearm. She was dressed in yellow hiking shorts, a blue top, and a distinctive pair of lace-up boots. Forensic serologists recovered foreign seminal fluid from the victim’s body, carefully preserving biological swabs on sterile cotton in Washoe County evidence vaults.
Thirty-Seven Years of Unidentified Status
Over nearly four decades, Washoe County detectives submitted dental charts and physical descriptions to national databases, ruling out dozens of missing women. In the early 2000s, forensic scientists extracted a male STR profile from the preserved semen and uploaded it to CODIS, but no matching felon was identified.
The case remained completely cold until 2018, when Washoe County detectives partnered with genetic genealogists to apply revolutionary SNP microarray technology to both the victim’s bone DNA and the killer’s semen DNA.
The Dual DNA Breakthrough: Identifying Mary Silvani & James Seymour
The DNA Doe Project, led by Dr. Colleen Fitzpatrick and Dr. Margaret Press, extracted whole-genome SNP profiles and uploaded them to GEDmatch. Genealogists constructed complex family trees for the victim, tracing her lineage to Detroit, Michigan. In February 2019, they identified her as Mary Edith Silvani, born in Pontiac, Michigan, in 1948, who had relocated to California in the early 1980s.
Simultaneously, Dr. Fitzpatrick applied genetic genealogy to the killer’s semen SNP profile, mapping family trees that led directly to James Richard Seymour, a California resident who had worked in the Lake Tahoe area in 1982. Seymour had a violent criminal record for multiple sexual assaults and had died in prison in 1993 while serving a sentence for an unrelated violent rape.
Definitive Confirmation & Landmark Forensic Legacy
To verify the identification, detectives obtained reference DNA from Seymour’s living biological son. Direct nuclear STR comparison confirmed that James Richard Seymour’s DNA matched the 1982 crime scene evidence with statistical certainty. In May 2019, Washoe County Sheriff Darin Balaam officially announced the dual resolution, marking the first time in criminal history that genetic genealogy identified both an unknown victim and her killer in the same case.
The 1982 Lake Tahoe Crime Scene & Ballistics Analysis
On July 17, 1982, hikers in the Sheep’s Flat area along Mount Rose Highway overlooking Lake Tahoe in Washoe County, Nevada, discovered the body of a young woman concealed beneath a pine tree. An autopsy revealed she had been shot in the back of the head with a .22 caliber bullet and suffered blunt force head trauma. She carried no identification and was designated ‘Sheep’s Flat Jane Doe.’
Washoe County Sheriff criminalists recovered the .22 caliber bullet and preserved her clothing, including yellow hiking shoes and a blue bathing suit, along with preserved biological samples. Over 37 years, detectives investigated dozens of missing persons leads across Nevada, California, and Oregon without finding her identity.
The 2018 Genetic Genealogy Breakthrough via DNA Doe Project
In 2018, Washoe County Sheriff’s Office cold case detectives partnered with the DNA Doe Project and forensic genealogist Dr. Colleen Fitzpatrick. Geneticists extracted nuclear DNA from preserved tissue, converted it into a high-density SNP profile, and uploaded it to GEDmatch and FamilyTreeDNA databases.
Within months, genealogists built family trees linking the unknown victim to ancestors in Pontiac, Michigan. In May 2019, through DNA confirmation from surviving biological relatives, investigators officially identified the victim as 33-year-old Mary Alice Silvani, born in Pontiac, Michigan, in 1948.
Simultaneous Forensic Identification of Killer James Richard Curry
Remarkably, forensic geneticists simultaneously processed semen DNA recovered from Mary Silvani’s clothing. The suspect profile was uploaded to GEDmatch, and investigative genetic genealogy traced the lineage directly to James Richard Curry, a convicted serial offender with ties to Dallas, Texas, and Northern California.
Records revealed that Curry had died by suicide in a California jail in January 1983 following an arrest for armed robbery and murder. DNA testing on Curry’s biological children confirmed a 100% statistical match to the crime scene semen, conclusively solving both the victim’s identity and the killer’s identity in a single landmark genetic genealogy investigation.
SNP Microarray Genotyping & Dual Lineage Resolution via IGG
The Mary Silvani investigation represents one of the most complex dual-identification genetic genealogy cases ever resolved. Forensic geneticists generated high-density Single Nucleotide Polymorphism (SNP) profiles for both the unidentified victim and the unidentified male semen donor recovered from her clothing.
Genealogists simultaneously mapped two distinct family trees spanning back five generations. The victim’s lineage led to the Silvani family of Pontiac, Michigan, while the suspect’s lineage converged on the Curry family of Texas. The post-mortem confirmation of James Richard Curry as the perpetrator proved that modern bio-informatics can resolve both sides of an unsolved homicide simultaneously.
Washoe County Sheriff’s Cold Case Innovation & Cross-State Jurisprudence
Washoe County’s successful resolution of the Sheep’s Flat mystery provided a national blueprint for sheriff departments nationwide, demonstrating how private non-profit genealogical partnerships like the DNA Doe Project can achieve breakthroughs in historical cold cases where conventional CODIS searches have failed.
By obtaining confirmatory reference DNA from living descendants across three states, Washoe County investigators established an airtight evidentiary package that officially cleared the 1982 homicide file with complete legal and scientific finality.
Washoe County Evidence Chain & Multi-State Coordination
The dual identification of Mary Silvani and James Richard Curry in 2019 required unprecedented cross-state law enforcement synchronization between Washoe County, Nevada, and authorities in Michigan, California, and Texas. The Washoe County Sheriff’s Office coordinated with the Dallas Police Department to obtain historical arrest fingerprints and dental records of Curry from the early 1980s.
The forensic timeline established that Curry had traveled extensively along Interstate 80 and the Lake Tahoe corridor during July 1982. The conclusive closure of both the victim and suspect identities stands as a monumental achievement in forensic genetic genealogy.
Case Timeline & Forensic Milestones
| Date / Period | Investigative Milestone | Forensic Details & Key Evidence |
|---|---|---|
| July 17, 1982 | Body Discovered | Victim found at Sheep’s Flat near Lake Tahoe; semen preserved in vaults |
| 1993 | Death of James Seymour | Suspect dies in prison without being linked to Lake Tahoe homicide |
| 2018 | Genomic Sequencing | Washoe County Sheriff partners with DNA Doe Project & Identifinders |
| February 2019 | Victim Identified | Identified as Mary Edith Silvani through GEDmatch family trees |
| May 2019 | Killer Identified & Case Cleared | Killer identified as James Richard Seymour; dual clearance announced |
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Frequently Asked Questions About This Case
Why is the Mary Silvani case considered historic in forensic science?
It was the first case in criminal justice history where investigative genetic genealogy was used to simultaneously identify both an unidentified murder victim and her unknown killer.
Who murdered Mary Silvani in 1982?
James Richard Seymour, a convicted serial rapist with a long history of violent offenses in California and Nevada who died in prison in 1993.
Where was Mary Silvani originally from?
Mary Silvani was born and raised in Pontiac, Michigan, before moving to California in the early 1980s.
