Absalom, Absalom

Stairway in Absalom's Pillar; Another view inside Absalom's Pillar ]All Israel and Judah flocked to his side, and David, attended only by the Cherethites and Pelethites and some recent recruits from Gath, found it expedient to flee. The priests remained behind in Jerusalem, and their sons Jonathan and Ahimaaz served as his spies.

David had charged his men to deal gently with Absalom but Joab, David's commander, killed Absalom by thrusting three spears through his heart as he struggled in the branches followed by his ten armor-bearers who came around and slew him.

Source: Wikipedia > Absalom