Sylvia Lourdes Standley, 31, disappeared from Modesto, California, after her release from the Stanislaus County Women’s Facility on June 3, 1986. She had completed a two-week sentence for a drug charge and contacted family to say she would get a ride home with a new boyfriend — a man her family said they had never met and whose identity is unknown. She was last seen getting into a blue or green truck and was never heard from again. Sylvia left behind two children, including an eight-month-old baby.

Reports give slightly different dates for her disappearance, with May 29 and June 6 also appearing in some accounts. Distinguishing details: light brown hair, hazel eyes, a V-shaped scar on her knee, an appendectomy scar, and two missing upper front teeth. Investigators have repeatedly looked into links with Wesley Shermantine and Loren Herzog, known as the Speed Freak Killers, but none of the bodies recovered from sites Shermantine identified have been confirmed as Standley. The case remains open and unsolved.

Did anyone in Modesto at that time know Sylvia, the boyfriend she mentioned, or the truck she got into?