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.
Ted Bundy. Bundy confessed to roughly 30 murders by the time of his 1989 execution, but experts estimate that he used his charm and good looks to commit several more. He was only convicted of three slayings total.