with the da steve lungen. >> did you feel like outbreak? >> i needed more information. >> investigators said love friends down to hear her story. >> let's start back in the beginning. okay. 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 telephone, 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 a 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 murder. that alibi was alive.