Daisy's Pick Blind Date - S4-E7
Revealing mistake: When John and Roy bring the hypothermic patient into treatment 3, Morton uses the laryngoscope, but the problem here is that when it's placed we can see that the laryngoscope is actually at the side of the patient's face.
Answer: I believe you are speaking of the old man, Mr. Wilson. He's played by J. Pat O'Malley.
Bishop73
Correct, it was J. Pat O'Malley...he also played the grandfather with his grandson when their rocket exploded, and also played "Old Bill" in the episode with Ann Prentiss, where Gage saves the little girl from the burning tree house, and her mother falls in love with him.