In this 1986 file photo, Convicted killer Charles Manson is seen during a parole hearing in California. In February, 2008, a team of forensic researchers visited the Death Valley ranch where Manson took refuge and found at least two sites that could be clandestine graves holding the bodies of additional victims. On Tuesday, May 20, 2008 investigators will be back at the ranch again looking at the site. (AP Photo)