By Tanangachi Mfui and Alison Gendar
The Daily News
NEW YORK — A retired NYPD sergeant was shot and killed by an on-duty cop in Staten Island this morning after he repeatedly refused to drop his gun.
Sources identified the victim as Jason Aiello, a bodyguard of jewler Louis Antonelli, who was fatally shot in the borough in April.
Retired NY Sgt. killed in apparent 'suicide-by-cop'