Joseph Kallinger was a serial killer from the Philadelphia area. In 1972 he was diagnosed with paranoid schizophrenia and eventually killed his own son. Several years later alongside his other son Michael who was 12, they embarked on a crime spree where they robbed, assaulted and tortured 4 different families. He also murdered two people. Kallinger was eventually arrested and charged for 3 murders including of his own son as well as a litany of other charges for the spree. He plead insanity clai

Before being executed, these serial killers gave us chilling, disturbing interviews | WatchMojo