Albert Barnes Commentary 2 Samuel 3:34

"Thy hands were not bound, nor thy feet put into fetters: As a man falleth before the children of iniquity, so didst thou fall. And all the people wept again over him." — 2 Samuel 3:34 (ASV)

Your hands were not bound... — This thought prepares the way for the solution; Abner had been treacherously murdered by wicked men.