He was the "racing mechanic" riding with "Billy Arnold" [qv] when he won the Indianapolis 500 in 1930. Although primarily employed as a real estate salesman, he also was a champion motorcycle racer and was a wing-walker on barnstorming biplanes. Matlock was killed in a crash at the old Legion Ascot Speedway in the Lincoln Heights section of Los Angeles in January 1936. After the accident, the racetrack was closed and eight months later burned to the ground.