They had entered the house while Ish-bosheth was lying on his bed, and having stabbed and killed him, they beheaded him, took his head, and traveled all night by way of the Arabah.
KJV
For when they came into the house, he lay on his bed in his bedchamber, and they smote him, and slew him, and beheaded him, and took his head, and gat them away through the plain all night.
ASV
Now when they came into the house, as he lay on his bed in his bedchamber, they smote him, and slew him, and beheaded him, and took his head, and went by the way of the Arabah all night.