a woman from paul's past, michelle. >> michelle lafrance who was the defendants alibi, in 2008.aid, paul was not home, paul went to narrowsburg and paul killed catherine. >> what was that phone call like? >> it was now time to get to work. >> jim farrow was now the district attorney, he teamed up with the former da steve lungen. >> did you feel like you had a break? >> i needed more information. >> investigators sat lafrance down to hear her story. we during a six hour interview, michelle laid out what she claimed, was the story of how paul killed catherine. she said he started plotting weeks before the murder. >> he was researching things on the internet, he was going to chloroform her, leave her, and burn the house down. >> michelle says one week before the fire, she and paul went to catherine's house to move his things out, and paul unlocked the basement doors. >> so that he can go up the next time would have the kids, which would be a week later. and that way he could sneak into the house and she would know. >> according to michelle, paul wasn't with her on the night of a mu