drove. >> reporter: tubbs said the man he saw was standing beside a black truck. stewart owned a black truck, same kind. >> and it's a new model and it's a chevy. you look everything up and it's all coming together. >> he's denied any involvement in her disappearance and said he was never alone with her. >> still, cal's side was convinced that he played some role in michele's disappearance. >> in 2015 trial number 3 began with a change of venue. >> to have forensic scientists get up and speculate and guess at how old blood was based on the color from a photograph is an outrageously unsupported proposition. >> reporter: also out? hearsay testimony from prosecution witnesses who said michele told them that cal threatened her life. >> we don't think they belong in evidence. it's part of the reason the case was unfair the first time, the