Iowa son fights to overturn his father's conviction in mother's murder

Trysten Mullis was 13 when he found his mother Amy Mullis impaled with a corn rake at the family's Iowa farm. In an exclusive interview, the now 21-year-old is speaking out about what he says he witnessed, determined to overturn his father Todd's murder conviction.

Trysten Mullis was 13 when he found his mother Amy Mullis impaled with a corn rake at the family's Iowa farm. In an exclusive interview, the now 21-year-old is speaking out about what he says he witnessed, determined to overturn his father Todd's murder conviction.