see who she talked to in the hours and days before justin was shot to death. they also got a search warrant for david moffitt's house. and inside? no, they didn't find the murder weapon either. but they did find these strange notes, seemed to have been written by someone who had been watching justin and angie's neighborhood. >> those surveillance notes listed addresses in the immediate area around the crime scene. and they were very specific about when neighbors were turning on and off their lights. the creek behind the house is -- is it wide enough where i can jump across that? obviously, it looked like a way to make an escape once the murder was done. >> reporter: but then they found what looked like the mother lode -- a bill of sale. >> it was in andy wegener's name -- >> reporter: yeah! >> -- but there it was in david moffitt's house. >> reporter: that is, the bill of sale for a .9 mm carbine. and the name on the document, bold as brass, was indeed andy wegener. how was that remotely possible?