Transcript for New York Millionaire Cal Harris Faces 4th Trial
First the millionaire who is going on trial for a fourth time. Prosecutors are trying to show Cal Harris killed his wife but the defense is confident that new evidence will finally clear the father of four who has waved his right to a jury meaning that the verdict will be in the hands of the judge this time and ABC's Matt Gutman has more. Did you kill Michelle. Absolutely not. Absolutely not. And the fact that I'm sitting here and having to go through this is just a horror show. Reporter: For 15 years Cal Harris had been adamant he did not kill his wife. Nobody should have to go through this. Nobody. Reporter: In fact, he has given that same plea not once, not twice, but three times. Neither a murder weapon or her body has been found. Reporter: The first two guilty convictions overturned. The third trial ending in a hung jury. Through it all his four children supporting their dad. It was unfair. We shouldn't have to live at home without both parents especially because our dad didn't even do anything. Reporter: His team confident new information they've obtained will finally prove Harris' innocence. Harris' defense pointing to evidence found this January in this outdoor fire pit located in the home once owned by Stacy Stewart, the man the defense suspects was last seen with Michelle Harris the day she went missing. According to a filed motion, the items found by a forensics team include buttons, a partial shoulder strap from a bra, a knife blade, a woman's bathing suit, the latch of a woman's handbag and two fragments of charred fabric, the other light colored. Those colors match the coloring of the clothing that Michelle Harris was wearing the night she disappeared. Reporter: Now it's up to the judge to decide if the evidence is allowed to be introduced during the fourth trial. Unlike with a jury with a judge, you just need that one person to feel maybe there's not proof beyond a reasonable doubt. We need to know what happened with our mother. We know our dad had nothing to do with her disappearance. The fact that all four of his children support him is a very helpful fact, whether it is admissible in evidence or not and that's something that this judge will certainly know. Reporter: For "Good morning America," Matt Gutman, ABC news, New York. That is quite telling all of his children are standing by him. Fascinating case.
This transcript has been automatically generated and may not be 100% accurate.