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.
Albert DeSalvo. The Boston Strangler murdered 13 women from 1962-1964. Albert DeSalvo confessed to the killings and was sentenced to life in prison in 1967, but doubt remains that he was the killer.