A former suburban Houston police officer was executed Tuesday for hiring two people to kill his estranged wife nearly 30 years ago amid a contentious divorce and custody battle.Robert Fratta, 65, received a lethal injection at the state penitentiary in Huntsville for the November 1994 fatal shooting of his wife, Farah.For about three minutes before the execution began, Fratta's spiritual adviser, Barry Brown, prayed over Fratta, who was strapped to the death chamber gurney with intravenous needles in each arm.The Texas Board of Pardons and Paroles last week unanimously declined to commute Fratta's death sentence to a lesser penalty or to grant a 60-day reprieve.When he was offered an opportunity to at least extend an olive branch to his son that he knew was watching this."