
Investigation Discovery’s The Serial Killer’s Apprentice focuses on the murders committed by Dean Corll (known as The Candyman Killer) as recalled by his accomplice, Elmer Wayne Henley Jr. The two-hour documentary, which features the first interviews with Henley Jr. in over 50 years, will premiere on Sunday, August 17, 2025 at 9pm ET/PT.
Criminologist Dr. Katherine Ramsland and Tracy Ullman’s book inspired the documentary, and Dr. Ramsland’s probing interviews with Henley are featured in the film.

ID offers this description of the documentary:
“Infamously known as ‘The Candyman Killer,’ Dean Corll stalked the streets of Houston, Texas, in the early to mid 1970s, luring and brutally killing at least 28 young men. Corll operated largely undetectably for years due not only to his unassuming nature in the community but largely because of the help he received by two young accomplices—Elmer Wayne Henley Jr. and David Brooks.
However, in 1973, Henley fatally shot Corll and subsequently confessed to their crimes, leading authorities to Corll’s burial ground to recover the victims’ bodies. Decades later, Henley speaks now for the first time in 50 years with Dr. Ramsland, offering unprecedented and chilling insight into what led to his complicities in Corll’s crimes. Featuring conversations between Dr. Ramsland and Henley from the 60 hours they spoke, The Serial Killer’s Apprentice will offer a wholistic portrait of Henley, his psyche, and the tragedy that still lingers in Houston, Texas following Corll’s reign of terror.
In addition to Dr. Ramsland bringing extensive experience to unpacking Henley’s accomplice and master dynamic with Corll, the docuseries will also offer access to expansive archival footage and insight from victims’ loved ones, local authorities, and journalists who are still unpacking the extent of Corll’s crimes decades later.”
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