Serial killer Kenneth McDuff held back on revealing where he buried Colleen Reed's body.

McDuff and his accomplice Hank Worley abducted Ms. Reed from an Austin car wash in 1991.

Seven years have passed, and the clock is ticking down toward McDuff's execution for her murder and that of Melissa Northrup.

Prison investigator John Moriarty, federal prosecutor Bill Johnston, and U.S. Marshal Mike McNamara spent hours on Texas death row trying to get McDuff to reveal the location of his victims' bodies.

The big break comes when Moriarty hears McDuff complaining about a painful toothache.

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