Rick Perry has defended his decision not to stay Willingham 's execution , calling him a `` monster . '' John Jackson was executed in 1992 for killing his three children . Webb asks that prosecutor in 2004 case be investigated . Ex-prosecutor : Allegations latest `` tack '' by death penalty opponents in case . John Jackson says he tried to protect informant after case , not coerce testimony .
John Jackson was executed in 1992 for killing his three children . Webb asks that prosecutor in 2004 case be investigated . Ex-prosecutor : Allegations latest `` tack '' by death penalty opponents in case . John Jackson says he tried to protect informant after case , not coerce testimony .