Coach Stahl was the diving coach for Mary Carroll in the Season 1 episode Kids. He was portrayed by actor Eddie McClintock. Coach Stahl is first seen when he is trying to convince Mary to make a less difficult dive, but she rejects his advice.
Later, at the hospital, he has to assist Eric Foreman in performing a lumbar puncture. With people running through the halls due to the meningitis epidemic, he also asks him to run interference so no-one jostles them while he is performing the procedure.