STATEN ISLAND, N.Y.-- A high-ranking NYPD officer who was questioned in the FBI corruption probe killed himself at a Long Island golf course Friday, according to a report in the Daily News.

Michael Ameri, 44, a commanding officer of the Highway Patrol Unit, was found dead in his vehicle of an apparent self-inflicted gunshot wound in Babylon, police said.

Ameri, who shot himself in the head at the Bergen Point Golf Course in West Babylon, was never disciplined after he was questioned, the report says.

The Suffolk County police Department will be investigating his death.

Nine police officers, including four from Staten Island, have been either stripped of their badges and guns or transferred in the ongoing investigation.

Detective Michael Milici of Bay Terrace was suspended. Deputy Chief Eric Rodriguez was transferred. Deputy Inspector James Grant and Deputy Chief Michael Harrington were stripped of their badges and guns and reassigned, police said.

The joint investigation is looking into whether members of the police force received gifts or cash in exchange for protection or other favors. Tickets for sporting events, vacations, cash or jewelry were some of the alleged bribes.