600 Killers

Richard Benjamin Speck became one of America's most infamous mass murderers after murdering eight student nurses during a single night in Chicago, Illinois, on July 13–14, 1966. The attack at a South Side townhouse generated worldwide attention and became one of the most notorious crimes in American history. Speck was convicted of eight counts of murder and sentenced to death, although his sentence was later commuted to imprisonment following changes to U.S. capital punishment laws. He died in prison in 1991.