A man shot two of his children and his young stepdaughter to death before killing himself Monday in a violent end to a standoff that began hours earlier at their home, police said. A fourth child was wounded in the shootings in Katy, west of Houston. She has a critical injury to her left arm, police spokesman Robert Hurst said. Authorities said Timothy Lee Rumsey, 42, had been holding the children hostage since about 11 p.m. Sunday, shortly after Rumseys wife, Joy, went to police to report that he had threatened the children after the couple had fought. The man spoke briefly to negotiators early Monday, but hung up on them after saying the children were in jeopardy. Police said they believe Rumsey likely killed the children shortly after his wife left the house about 11 p.m. Their bodies were found in a closet in the master bedroom. The dead children were identified as Kirstie Rumsey, 7; Dylan Rumsey, 9; and Brittany Whalen, 11, a child from the mother’s previous marriage.