Texas to execute man convicted of stabbing family in 2007

Robert Sparks, 45, who was convicted of stabbing his wife and two stepsons to death and sexually assaulting his two stepdaughters in their home in 2007 saying he believed his spouse was poisoning him, is scheduled to be executed in Texas on Wednesday. Sparks is set to die by lethal injection at 6 p.m. in Huntsville.