Albert Barnes Commentary 2 Samuel 3:33

"And the king lamented for Abner, and said, Should Abner die as a fool dieth?" — 2 Samuel 3:33 (ASV)

Lamented – that is, composed and sang the funeral dirge that follows (Compare 2 Samuel 1:17).

Died Abner... – that is, the great, noble, and valiant Abner had died as ignobly and helplessly as the most worthless fool!