- All of his four children's names begin with the letter D.
- Was a Free Methodist.
- Was an infantry sergeant during the Korean War and received a Purple Heart.
- Was a high-school English and drama teacher before pursuing acting.
- Known for his role of Hoss Cartwright, the Gentle Giant, in the television series Bonanza (1959-73).
- Dirk Blocker — Son
- Mary Arizona Blocker — Mother
- Danna Lynn — Daughter
- Debra Lee Blocker — Daughter
- Ora "Shack" Blocker — Father
- David Blocker — Son
- Dolphia Parker Blocker — Wife
- Hardin-Simmons University, Abilene, Texas, United States (degree in English); Sul Ross State Teacher's College, Alpine, Texas, United States (Master's degree in Dramatic Arts)