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298 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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Summary based on the NamUs case record (MP8285) and 8 other sources
In the early months of 1984, a 19-year-old woman named Tammy Dawn Risenhoover vanished from Tulsa, Oklahoma. The specific date of her disappearance remains uncertain, a detail that mirrors the many unanswered questions that have shrouded her case for decades. Tammy, a female with dark brown hair and hazel eyes, stood between 5'2' and 5'3' and weighed approximately 130 pounds. She had a distinct purplish-colored birthmark on the back of her neck at the hairline and occasionally wore glasses. Compounding the mystery is the fact that she was not officially reported as a missing person until March 6, 1990, a full six years after she was last seen.

The circumstances surrounding Tammy's disappearance are considered suspicious by law enforcement, and they strongly suspect that she was a victim of foul play. At the time she went missing, she was known to be associated with a local motorcycle gang. This connection has been a focal point of the investigation, suggesting a potentially dangerous environment that may have contributed to her disappearance. Tammy also had a history of epilepsy, a medical condition that could have made her vulnerable. The combination of her associations and the suspicious nature of her vanishing has led investigators to believe that she did not leave on her own accord.

Decades have passed since Tammy Risenhoover was last seen, and her case has grown cold, filed away among the unsolved mysteries of the Tulsa Police Department. The significant delay in reporting her missing created a formidable obstacle for investigators, as the crucial early days of the investigation, when memories are freshest and evidence is most readily available, were lost. Over the years, her story has been shared by various organizations dedicated to finding the missing, hoping to jog someone's memory or unearth a new lead. The overview of Tammy's case is a narrative of profound loss and lingering uncertainty. A young woman on the cusp of adulthood disappeared, leaving behind a family to grapple with her absence and a community with an enduring mystery. The lack of resolution in her case highlights the painful reality for many families of the missing, who are left to wonder about the fate of their loved ones.

Last Seen: Feb 1, 1984

Possible Unidentified Matches (3)

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.

77%Possible
Jane Doe — Prue, Oklahoma
UP9925 • Found Aug 4, 2011
View case
Sex ✓Female
Age 100%Est. 35–45 vs 19 when missing
Race 100%White
Location 98%17 mi away, same state
TimingFound 28 years after last seen
Height 100%5'2" vs 5'2"–5'3"
76%Possible
Jane Doe — Oklahoma City, Oklahoma - unidentified case UP5175
Jane Doe — Oklahoma City, Oklahoma
UP5175 • Found Mar 6, 1996
View case
Sex ✓Female
Age 85%Est. 30–50 vs 19 when missing
Race 100%White
Location 79%85 mi away, same state
TimingFound 12 years after last seen
Height 100%5'3" vs 5'2"–5'3"
Weight 100%123 lb vs 130–135 lb
Hair 100%Brown vs Brown
Eyes 60%Brown vs Hazel
75%Possible
Jane Doe — Moore, Oklahoma
UP156660 • Found Feb 28, 2026
View case
Sex ✓Female
Age 100%Est. 16–28 vs 19 when missing
Race 100%White
Location 75%101 mi away, same state
TimingFound 42 years after last seen
Height 100%5'2" vs 5'2"–5'3"
Weight 100%133 lb vs 130–135 lb
Hair 100%Brown vs Brown
Eyes 30%Blue vs Hazel

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.

Unidentified photos are blurred because many are post-mortem. Tap a photo to reveal it.