The Green River killer -- believed to be the United States' most prolific serial killer

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."

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