Police believe Alcala killed 28-year-old Thornton, of San Antonio, Texas, during the summer of 1977 and disposed of her body in a remote area northeast of Granger in rural southwest Wyoming.
Human remains found by a local rancher in 1982 weren’t identified as Thornton’s until 2015.
The photo was found while searching Alcala's possessions during a previous investigation.
Alcala is imprisoned in California's Corcoran State Prison and is sentenced to death.
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in 1978 — and subsequently, a place in history as one of America's most prolific serial killers.
Through parallel storylines, the movie also follows Carrie Preston () will direct a script written by Leslie Greif and Darrell Fetty.He has been connected to six murders in two states, though authorities estimate he may have killed up to 130 people across the country.Alcala appeared on the game show in 1978 -- the year after Thornton was found dead.The three will executive produce with ID's Angela Bromstad.Greif's Think Factory Media will produce for Investigation Discovery. “ID has become the premier destination for consistent, high-quality true crime content, and we’re excited to extend our storytelling with our first scripted movie,” said Henry Schleiff, Group President, Investigation Discovery, American Heroes Channel and Destination America.