A California panel denied parole for serial killer Charles Manson on April 11, 2012 and scheduled the 77-year-old's next parole hearing to take place in 15 years. Here's a look at other notorious serial killers.
Gary Ridgway. The Green River Killer pleaded guilty to 48 murders in King County, Washington, starting in 1982, making him the nation's worst serial killer in history.
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