Charles Manson, one of the most infamous killers in U.S. history, died Sunday at the age of 83. He had spent the last 45 years in prison. The California Department of Corrections and Rehabilitation said Manson died of natural causes at a hospital in Kern County. Manson led a small cult group and persuaded his followers to carry out murders of powerful people in the Los Angeles area in 1969. Manson and six of his followers were sent to prison in 1971. Three additional followers were later jailed for crimes linked to Manson.