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.

source https://www.cbsnews.com/news/amy-mullis-todd-mullis-iowa-corn-rake-witness-48-hours/