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.
Richard Ramirez. Ramirez became a heavy drug user and Satan worshipper by the age of 18. In 1989, he was convicted for 13 murders in California that occurred from 1984-1985. His nickname, the "Night Stalker" was inspired by his favorite rock group – AC/DC.