Elmer Wayne Henley Jr. (born May 9, 1956) is a convicted American serial killer and painter incarcerated in the Texas Department of Criminal Justice (TDCJ) system. Henley was convicted in 1974  for his role as a participant in a series of murders known colloquially as the Houston Mass Murders in which a minimum of 28 teenage boys and young men were abducted, tortured, raped and murdered by Dean Corll between 1970 and 1973. Henley and David Owen Brooks (Corll's other teenage accomplice), together and individually, lured many of the victims to Corll's home. Henley, then 17 years old, shot Corll dead on August 8, 1973.

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