Dorothea Puente was a serial killer who victimized her elderly and/or mentally disabled tenants and cashed in their social security checks.
The Smiley Face Killers Theory explores the possibility of an unidentified serial killer drugging young men before drowning them.
Mohammed Bijeh aka The Desert Vampire was an Iranian serial killer and pedophile who raped boys from March to September 2004.
Patrick Kearney aka The Freeway Killer was known to be a serial killer suffering from necrophilia targeting young men in California.
Paul John Knowles aka The Casanova Killer was active for only four months in 1974 but killed, raped, and robbed people in several states.