Overview

• The Serial Killer’s Apprentice premiered August 17 on Investigation Discovery and is now streaming on HBO Max, marking Henley’s first extensive on-camera account of his role in the 1970–73 Houston killings.
• Dr. Katherine Ramsland assesses that Henley expresses genuine remorse and frames his involvement as the result of Dean Corll’s systematic grooming.
• The film combines archival evidence and new testimony to revisit how Corll enlisted Henley and David Brooks to lure at least 28 victims under false promises of money and safety.
• Henley, now 69 and serving consecutive life terms at the Barry B. Telford Unit, was convicted in 1974 for six murders and has been denied parole multiple times.
• His next parole eligibility is October 2025, renewing debate over his rehabilitation prospects and accountability more than 50 years after the crimes.