Alexander Pichushkin - The Chessboard Killer

Jeffrey Lionel Dahmer (May 21, 1960 – November 28, 1994), also known as the Milwaukee Cannibal, was an American serial killer and sex offender, who committed the rape, murder, and dismemberment of seventeen men and boys between 1978 and 1991. Many of his later murders involved necrophilia, cannibalism, and the permanent preservation of body parts—typically all or part of the skeletal structure. Although diagnosed with borderline personality disorder, schizotypal personality disorder, and a psychotic disorder, Dahmer was found to be legally sane at his trial. Convicted of fifteen of the sixteen murders he had committed in Wisconsin, Dahmer was sentenced to fifteen terms of life imprisonment on February 15, 1992. He was later sentenced to a sixteenth term of life imprisonment for an additional homicide committed in Ohio in 1978. On November 28, 1994, Dahmer was beaten to death by Christopher Scarver, a fellow inmate at the Columbia Correctional Institution.

Alexander Yuryevich "Sasha" Pichushkin (Russian: Алекса́ндр Ю́рьевич Пичу́шкин, born 9 April 1974), also known as The Chessboard Killer and The Bitsa Park Maniac, is a Russian serial killer. He is believed to have killed at least 48 people, and possibly as many as 60, in southwest Moscow's Bitsa Park, where a number of the victims' bodies were found.

Dennis Lynn Rader (born March 9, 1945) is an American serial killer who murdered ten people in Sedgwick County, Kansas between 1974 and 1991. He is also known as the BTK Killer or the BTK Strangler. "BTK" stands for "Bind, Torture, Kill", which was his infamous signature. He sent letters describing the details of the murders to police and local news outlets before his arrest.