OMAHA, Neb. (AP) — An Omaha officer who fatally shot an unarmed man last month has resigned following a departmental investigation.

The Omaha Police Department said in a news release on Tuesday that the Internal Affairs investigation into the Feb. 23 shooting had been completed and that Chief Todd Schmaderer (SHMAH’-dur) had accepted the resignation of Officer Alvin Lugod.

The news release did not say whether Lugod had violated any departmental policies or say why he quit. A police spokeswoman didn’t immediately return a message from The Associated Press, seeking comment.

A grand jury had cleared Lugod in the shooting of 39-year-old Danny Elrod, who was a suspect in a robbery at a nearby store.