United Kingdom 
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We couldn’t find any streaming options in New Zealand, but The Serial Killer's Apprentice is available in Canada and 5 other countries on Citytvplus Amazon Channel, Citytvplus, and 6 other services.
The documentary explores the story of Elmer Wayne Henley Jr., an accomplice to the infamous Houston serial killer, Dean Corll, also known as "The Candyman Killer." The program features an in-depth, never-before-seen interview with Henley, who speaks for the first time in over 50 years about his involvement in the murders. It examines the psychological dynamic between a predator and a vulnerable teenager and how Henley was groomed to become an accomplice in one of the worst serial murder cases in U.S. history.
