He was 85 when he passed away of natural causes in Sedona, Arizona on 31 August (11).
Warner edited TV and film before drawing his first credit as a supervising sound editor on Hell in the Pacific.
He went on to work on more than 60 movies, including Taxi Driver, Rocky II, Rocky III, Rocky IV, Raging Bull and Spartacus.
In 1978, he picked up an Academy Award for the sound effects on Steven Spielberg's Close Encounters of the Third Kind and he won a lifetime achievement award from the Motion Picture Sound Editors in 1988.
He is survived by his wife, Theodosia Greene, a son, daughter and three grandchildren.