2 Samuel 4:7-8

ISV(i) 7 While they were in the house, they struck him, killed him, and cut off his head while he was lying on his bed in his bedroom. They took his head, and traveled all night along the Arabah road.
8 David Punishes the Killers of Ish-boshethThey brought Ish-bosheth’s head to David at Hebron and told the king, “Look! Here’s the head of your enemy Ish-bosheth, Saul’s son, who sought your life. Today the LORD has given your majesty the king vengeance on Saul and his descendants.”