Texas ? A 32-year-old man who killed his estranged wife and two stepchildren in Fort Worth held Arlington, Texas, police at bay for several hours Friday afternoon, holed up in his car, before speeding off and driving into Lake Arlington, where he shot himself in the head.

Arthur Jackson was pronounced dead at the scene Friday night. On Saturday morning, the Tarrant County medical examiner’s office ruled Jackson’s death a suicide.

Police became aware of Jackson’s ordeal at 12:24 p.m. when Jackson dropped off his 3-year-old daughter at Mayfield Road Baptist Church in Arlington. The child was covered in blood but was uninjured. She has temporarily been placed in foster care.

“He stated to them that he just killed some people and was going to kill some more,” said Christy Gilfour, Arlington police spokeswoman.