Jack DeLeon

Jack DeLeon was an American actor. He is best known for playing Marty Morrison on the television series Barney Miller from 1975 to 1982. His film credits included Linda Lovelace for President , I Wonder Whos Killing Her Now and The Choirboys , and he voiced Sergeant Samuel McPherson in the 1977 Dr. Seuss animated television special Halloween Is Grinch Night. He was also known for the voice of Dwalin in the 1977 animated version of The Hobbit.

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Source: Wikipedia