like the people i slept with, like what are they thinking about it right now? oh, damn, a murderer. >> that kind of talk didn't prove anything, but it did strike investigators as odd as they continued gathering evidence. they decided to test some elements of madison's story. madison had said he didn't hear the gunshots so law enforcement did an experiment and they recorded it. >> we took the same weapon and the same grade ammo to do these tests. >> madison's story is that he ran from his dad's house to a neighbor 200 feet away and that he didn't hear his shots on his way or once he arrived. investigators listened closely. here's what that test sounded like standing at the neighbor's front door. to investigators that made madison a liar, a troubled kid who had exploded