Elmer Wayne Henley Jr. is an American serial killer 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, together and individually, lured many of the victims to Corll's home. Henley, then 17 years old, shot Corll dead on August 8, 1973.

A serial killer is a person who murders three or more people, with the killings taking place over a significant period of time between them. The serial killers' psychological gratification is the motivation for the killings, and many serial murders involve sexual contact with the victims at different points during the murder process. The Federal Bureau of Investigation (FBI) states that the motives of serial killers can include anger, thrill-seeking, financial gain, and attention seeking, and killings may be executed as such. The victims tend to have things in common such as, demographic profile, appearance, gender or race. The FBI will focus on particular patterns that the serial killers follow throughout their murders. They will then use on the patterns they find for key clues into finding the killer along with their motives. Although a serial killer is a distinct classification that differs from that of a mass murderer, spree killer, or contract killer, there are overlaps between them.