Dean Corll was a serial killer and sex offender who abducted, raped and killed at least 29 teenage boys in the early 1970s in Texas.

One of his accomplices, Elmer Wayne Henly Jr., will be the focus of the documentary, “The Serial Killer’s Apprentice.”

“The Serial Killer’s Apprentice” airs at 9 p.m. Sunday, Aug. 17, on Investigation Discovery.

LIVE STREAM: Viewers can watch Investigation Discovery without cable on Philo , which offers a seven-day free trial; and DirecTV , which has a five-day free trial.

The synopsis is, “Dr. Katherine Ramsland interviews Elmer Wayne Henley, the sole survivor of the 1973 Houston mass murders, to unravel his chilling journey from manipulated teen to convicted killer and the truth behind the line between victim and predator.”

Henley will talk about

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