connie's ex-son-in-law who stallmaker claimed may have had it in for the family. >> that was absolutely a lead that we needed to follow up on immediately. >> reporter: he's the first person who didn't like connie and larry? >> exactly. or so we were told and led to believe. >> reporter: so beals hit the road, bound for vegas and a meeting with connie's son-in-law. >> he didn't have a negative thing to say about connie in any way, shape or form. >> reporter: just as important, the son-in-law had a solid alibi. >> he corroborated his story as to where he was, and he received the backup that he was in a store at one time and clearly not in san diego, not in california, and his alibi all checked out. >> reporter: all of which put the guy who fingered him, stallmaker, under more suspicion. meanwhile, investigators put connie's truck up on a lift for a closer inspection. and in the soot dust on the floor pan, they saw an outline the size of a fedex envelope framed in traces of duct tape. the imprint of the earlier unexploded bomb. hardening their suspicion that, whoever built the bomb, was ta