after the mysterious death of his wife catherine, paul novak was trying to move on. new girlfriend. >>> welcome back to dateline. i'm craig melvin, after the mysterious death of his wife, catherine, paul novak was trying to move on. he relocated to florida and had a new girlfriend. then came that knock on the door and detectives placed paul under arrest. so, he with that some was claiming they had disturbing new details about that night of the fire. halls world was about to turn upside down. once again, here's andrea canning with secrets and lies. >> kathryn novak's death had been a cold case for more than three years went out of nowhere a witness came forward, pointing a finger at catherine's estranged husband, paul. so, who was this mystery witness? the woman from pulse past, his ex-girlfriend, michelle. >> michelle france, who was the defendants alibi in 2008, has now come forward and said, paul was not home. whole went it narrows and paul killed catherine. >> what was that phone call light? >> it was now time to get to work. >> jim farrell was now the district at

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