The Corn Rake Witness | Post Mortem

"48 Hours" correspondents Anne-Marie Green and Erin Moriarty discuss the case of Todd Mullis, who was convicted of killing his wife, Amy Mullis, with a corn rake. They share Moriarty's exclusive interview with their son, Trysten, who says his father is innocent and is fighting to overturn his conviction. They also break down the scientific analysis by new defense experts who believe Amy's death…