about to discover evidence that would call into question both the lamp and the murder weapon debbie reinboldt had given police. >>> concerns were mounting for lieutenant michael callahan as he reinvestigated the rhoads' murders. >> when you have witnesses that have questionable histories, it's doubly important to corroborate everything that they say. >> deborah reinboldt, in her story, talks about seeing a broken lamp and seeing one of the men holding up a piece of this broken lamp during the murders. >> the crime scene photos of the lamp raised questions for defense investigator bill clutter. >> you can actually see on the carpet where the firemen had removed the lamp that there was a silhouette of an intact lamp. what the lamp did is it protected that area of carpet. we were able to prove forensically that that lamp had to have been broken by firefighters as they entered room and after they suppressed the fire, not during the murders. >> that meant debbie reinboldt's testimony about the lamp had been false. even more troubling were facts callahan learned about the purported murder weapon. >