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Case Description

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Summary based on 2 sources
Peggy Joyce Jones Mandeville, a 39-year-old white female, went missing from the Camarillo/Oxnard, California area on or around September 1, 1978. At the time of her disappearance, she was described as being 5'2" tall and weighing approximately 100 pounds, with brown hair and green eyes. Mandeville may also have used her maiden name, Peggy Joyce Jones.

In 1978, Mandeville was admitted to Camarillo State Hospital for treatment of chronic depression. Sometime in September of that year, she left the hospital. After leaving the facility, she made phone calls to both her mother and her husband from a pay phone. This was the last time anyone is known to have heard from her.

The police in both Camarillo and Oxnard, California, are investigating her disappearance. Additionally, the Cape Girardeau Police Department in Missouri, which is where Mandeville's mother resided, is also involved in the investigation. A missing person report was filed with the Camarillo police department shortly after she went missing. Her mother also filed a report in Cape Girardeau, Missouri. Despite these efforts, her case remains unsolved. It has been reported that her ex-husband, who has since passed away in 2019, filed for abandonment before filing for divorce. Peggy's mother passed away in 1997, having never moved or changed her phone number in the hope that her daughter would one day make contact.
Last Seen: Sep 1, 1978

Possible Unidentified Matches (2)

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 — Calabasas Highlands, California
UP4424 • Found Sep 3, 1978
View case
Sex ✓Female
Age 100%Est. 25–40 vs 39
Race 100%White
Location 75%Same state
TimingFound 2 days after last seen
Weight 100%100 lb vs 100 lb
75%Possible
Jane Doe — California
UP4425 • Found Aug 13, 1978
View case
Sex ✓Female
Age 100%Est. 30–45 vs 39
Race 100%White
Location 75%Same state
TimingFound same day as last seen
Weight 90%85 lb vs 100 lb

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.