>> yes. >> and was that william slemp? reporter: and was the boyfriend perceived as a menace? the defense produced a request for a restraining order against slemp that rachael had filled out. during cross-examination the defense got detective jackie nichols to concede another connection between rachael and slemp. >> i recall seeing letters from william slemp. >> reporter: after seeding the thought with jurors that maybe someone other than capone did it, the defense team turned its sights on the cops. all the things they hadn't found in their investigation. for starters, there was no physical evidence recovered at charles' garage. >> you didn't see any signs of a struggle outside? >> that's correct. >> reporter: and when cops recovered rachael's vehicle, there were fingerprints, but not capone's. >> they didn't match anybody that was in the system. >> reporter: but attacking the evidence wouldn't be enough. >> everyone may be seated. >> reporter: just as for the prosecution, the defense case lived or died on the credibility