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"20/20" Extra: Kent Whitaker petitioned for clemency for his son, saying he was "the single greatest victim" in the case.
Bart Whitaker was convicted in 2007 of murdering his brother, mother.
Kent Whitaker said he forgave his son Bart Whitaker, who is on death row and scheduled to be executed this week.
The Texas Board of Pardons and Paroles, in a rare decision, is recommending the death sentence of convicted killer Thomas "Bart" Whitaker be commuted to life