Sean Whitesell (March 11, 1963 – December 28, 2015) was an American film and television actor, writer and producer.
Whitesell is best known for his portrayal of cannibalistic inmate Donald Groves, the initial cellmate of Miguel Alvarez (Kirk Acevedo), in season one of HBO's Oz, on which he was a regular until his character's execution.
Whitesell acted almost exclusively in television, aside from some early minor film roles, such as in Calendar Girl opposite Jason Priestley.
He also served as both a writer and a recurring guest actor on Homicide: Life on the Street, in addition to appearing in the television movie that concluded the series in 2000.
He also produced and wrote for several other successful series, including The Black Donnellys, Boston Public and Cold Case.