Exclusive interview: Son fights to clear father in corn rake murder case

Seven years after Iowa farmer Todd Mullis was convicted of killing his wife with a corn rake, his son Trysten is speaking out for the first time. He tells Erin Moriarty why he believes his father is innocent in an exclusive interview airing only on "48 Hours" this Saturday.

Seven years after Iowa farmer Todd Mullis was convicted of killing his wife with a corn rake, his son Trysten is speaking out for the first time. He tells Erin Moriarty why he believes his father is innocent in an exclusive interview airing only on "48 Hours" this Saturday.