Dean Arnold Corll was an American serial killer and sex offender who abducted, raped, tortured, and murdered a minimum of twenty-eight teenage boys and young men between 1970 and 1973 in Houston and Pasadena, Texas. He was aided by two teenaged accomplices, David Owen Brooks and Elmer Wayne Henley. The crimes, which became known as the Houston Mass Murders, came to light after Henley fatally shot Corll. Upon discovery, the case was considered the worst example of serial murder in United States history.

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.