Bobby Dan Davis Blocker (December 10, 1928 – May 13, 1972) was an American television actor and Korean War veteran, who played Hoss Cartwright in the long-running NBC Western television series Bonanza. Bobby Dan Davis Blocker (December 10, 1928 – May 13, 1972) was an American television actor and Korean War veteran, who played Hoss Cartwright in the long-running NBC Western television series Bonanza.