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Case Description

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Summary based on the NamUs case record (MP25934) and 3 other sources
In the autumn of 1980, 43-year-old Patricia 'Patty' Ann Lilly vanished into the crisp mountain air of the Pike National Forest in Colorado. Originally from Delaware, she had moved to be with a man she intended to marry. On October 5th, she and her 29-year-old companion from Woodland Park were hiking on Bison Mountain, a rugged peak southwest of Denver. Reports from that day indicate that Patricia was hiking behind her companion when she disappeared. She was well-equipped for the journey, carrying a week's worth of provisions, a sleeping bag, and warm clothing suitable for the cold nighttime temperatures that could drop into the 20s. Her sudden disappearance under these circumstances sparked immediate concern and a large-scale search effort.

The initial search for Patricia was extensive, covering a vast 400-square-mile area of the Colorado Rockies. Authorities and volunteers scoured the terrain near Bison Peak, as well as other locations like Tarryall, Lost Park, and Lost Creek, but found no trace of her. After more than a week of intensive searching with no success, the official search was called off. However, her companion stated his intention to continue looking for her. The case grew more perplexing as time went on, with the Park County Sheriff's Office suspecting foul play in her disappearance. In a move that highlighted the desperation and mystery surrounding the case, the Canon City District Attorney's Office even brought in a forensic psychic to assist in the investigation.

Decades have passed since Patricia Lilly was last seen on that mountainside, and her case remains an unsolved and painful mystery for those who knew her. The passage of time has not yielded any significant breakthroughs, and her whereabouts are still unknown. The Park County Sheriff's Office continues to list her as a missing person, a cold case that serves as a somber reminder of a life interrupted. The lack of evidence, witnesses, or any sign of Patricia has left a void of information, preventing any definitive conclusions about what happened to her on that fall day in 1980. The overview of the case is one of a woman who was prepared for a wilderness excursion, yet vanished without a trace, leaving behind a legacy of unanswered questions and an enduring sense of loss.

Last Seen: Oct 5, 1980

Possible Unidentified Matches (1)

Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

75%Possible
Jane Doe — Colorado
UP14596 • Found Apr 3, 1985
View case
Sex ✓Female
Age 84%Est. 50–60 vs 43 when missing
Race 100%White
Location 74%105 mi away, same state
TimingFound 4 years after last seen
Height 100%5'1"–5'5" vs 5'2"
Hair 100%Brown vs Brown

These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.