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Robert DeWayne Papenbrook was an American voice actor from California who was known for voicing the Black Knight Ghost from Scooby-Doo 2: Monsters Unleashed, Zhang Fei from Dynasty Warriors and Rito Revolto from Mighty Morphin Power Rangers. He had a son named Bryce, also a voice actor. He passed away in March 2006 due to a chronic lung infection. imdb.com