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.
Jeffrey Dahmer. Dahmer's murders remain among the most gruesome in American history. He was sentenced to 16 life terms for killing and dismembering 17 men and boys in the Milwaukee area. Dahmer was beaten to death in a prison shower in 1994.