As police hunt for clues to Chandra Levy's whereabouts, a man makes a grizzly discovery in a forested park -- a human skull; a new suspect with a disturbing criminal record emerges.
Intern Chandra Levy goes missing in Washington, D.C., in May 2001; later, her remains are found in Rock Creek Park; an investigation into the case includes interviews with her parents, journalist Connie Chung and former Rep. Gary Condit (D-Calif.).