From a New York Times obit by Joseph P. Fried and Clay Risen headlined “Andrew J. Maloney, Prosecutor Who Took Down John Gotti, Dies at 90”:

Andrew J. Maloney, the United States attorney in Brooklyn who shattered the myth of the Teflon Don with the successful prosecution of the flamboyant Mafia boss John J. Gotti, died  in Greenwich, Conn.

His son Andrew, also a former federal prosecutor, said the cause of death, was heart failure.

Mr. Maloney, a street-smart graduate of West Point and a college boxing champion, was the United States attorney for the Eastern District of New York, heading the Justice Department office responsible for Brooklyn, Queens, Staten Island and Long Island, from 1986 to 1992.