206 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.
Case Description
Any updates on this case?
A 15 year old girl's body is found 10 months after she vanished from a bus stop
On January 1, 1971, the body of 15-year-old Cosette Ellison was found in a ravine at the foothills of Mount Diablo in Contra Costa County, California. She had been missing since late 1970, and her remains were discovered nude and partially buried. The case remains unsolved, though investigators suspect that Cosette may have been a victim of Philip Joseph Hughes, a convicted serial killer linked to other murders in the area during the same period.
Investigations into her death revealed d ...Read More
On January 1, 1971, the body of 15-year-old Cosette Ellison was found in a ravine at the foothills of Mount Diablo in Contra Costa County, California. She had been missing since late 1970, and her remains were discovered nude and partially buried. The case remains unsolved, though investigators suspect that Cosette may have been a victim of Philip Joseph Hughes, a convicted serial killer linked to other murders in the area during the same period.
Investigations into her death revealed d ...Read More
Links to Additional Sources (7)
See any mistakes?Victim Details
Cosette Ellison
April 24, 2023
Female
Caucasian / White
Contra Costa County
CA
1971-01-01
1970-03-03
1954-03-16
15
Cosette Ellison
Cosette
Ellison
No
11/08/2025
Area Body Found:
Forum Posts (3)
I've been following the case of Cosette Ellison for a while, and it's honestly so troubling to see h... ...Read More
11/26/2023
11/26/2023
Has anyone else delved into the eerie similarities between the murders of Cosette Ellison, Maureen F... ...Read More
09/30/2023
09/30/2023
It's truly concerning how many unsolved cases there are like Cosette Ellison's, especially in the sa... ...Read More
05/01/2023
05/01/2023
