Cameron Todd Willingham was executed by the state of Texas in 2004. He was tried, convicted, and executed by lethal injection for setting fire to his home and killing his three young daughters, on December 23, 1991.

But forensic investigators have called the facts of the case into question – most notably whether the fire was arson, or an accident. (Willingham maintained his innocence to the very end, passing up a chance to plead guilty in exchange for a life sentence.)