July 31, 1957 (age 52) Dirk Blocker (born July 31, 1957) played Abel Makay in the episode School Mom on Little House on the Prairie. His father is Dan Blocker, who played Hoss Cartwright on Bonanza. Other works for Blocker include M*A*S*H, MacGyver, Murder, She Wrote, Walker Texas Ranger, Doogie Howser, M.D., among others. He is currently married to actress Danielle Aubuchon.