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Context
What happened: Seven years after Iowa farmer Todd Mullis was convicted of killing his wife with a corn rake, his son Trysten speaks out for the first time, telling Erin Moriarty he believes his father is innocent.
Why it matters: The exclusive interview airs only on "48 Hours" this Saturday.
Key numbers: Seven years since the conviction.
What changed
Seven years after Iowa farmer Todd Mullis was convicted of killing his wife with a corn rake, his son Trysten speaks out for the first time, telling Erin Moriarty he believes his father is innocent.