The Green River killer
-- believed to be the United States' most prolific serial killer -- is now facing charges in a 49th murder. The remains of Becky Marrero were found by some teenagers in December. Gary Ridgway had already confessed to killing Marrero a few years ago, but authorities didn't charge him then because he couldn't provide enough information to support a charge.He can't be put to death in this case, thanks to a plea deal that gave him life in exchange for information about his victims. But if he's ever convicted of a killing outside King County, Wash., that deal wouldn't be in play."
