In the episode "The Perfect Circle" (1959) of the CBS crime drama Tightrope, starring Mike Connors, Alaniz was cast as a detective. In 1972, in one of Alaniz's last television roles, he played a Doctor in the episode "Broker Mirror" of the CBS series Mannix, also starring Mike Connors. Alaniz played Manuel Ortega, who ambushes a stagecoach carrying a man accused of murdering Ortega's sister, in the 1960 episode, "Day of Vengeance" of the NBC western series, Laramie, starring John Smith and Robert Fuller.