assumptions. those cops found something else near the accident scene. sort of thing that could make a person wonder, what in heaven's name is going on here? it was one little thing. in a shoebox. >> the shoes were not in it but there was various paperwork. one of the things that were found was a receipt from a local car dealership and the receipt was for a purchase of three oil changes, had the name of andrew wegener. >> reporter: andrew wegener, the boyfriend angie lived with before justin. weird. another guy without a criminal record. another apparently ordinary person, a des moines funeral director, in his case. and yet, there it was in black and white, among all of those other pieces of evidence, andrew wegener. >> how do he explain that? >> at that time, you don't. >> so did andy wegener kill justin michael, the man who replaced him in angie's heart? >> so we immediately went to