HUNTSVILLE, Texas (AP) — A Texas inmate who claimed he was intellectually disabled was executed Wednesday for fatally stabbing his two stepsons during a 2007 attack in which his wife also died.

Robert Sparks received a lethal injection at the state penitentiary in Huntsville for the slayings of 9-year-old Harold Sublet and 10-year-old Raekwon Agnew in their Dallas home. Sparks, 45, became the 16th inmate put to death this year in the U.S. and the seventh in Texas.

"I am sorry for the hard times. And what hurts me is that I hurt y'all ... even y'all, too," Sparks told his relatives and friends...