Who killed Cheyenne?

[Rinaldo]

I know this is probably quite obvious, but through lack of good hearing and my tv's poor sound quality I missed the answer. Who dealt the Cheyenne the fatal gunshot?

Thanks

[Cusser]

Mr. Choo-Choo (Morton).

[Rinaldo]

Thanks! I thought Cheyenne said, "that half-man, Mr. Churchill." I thought to myself, "who the hell was Mr. Churchill?" All is clear now, thanks again.

[DJIMBO]

yeah i wondered what the hell cheyenne was saying first time around then i remembered back to the bit after harmonica and cheyenne have broken into morton's train and killed all his guards, and cheyenne says: "Hey come back here, Mr. Choo-choo!"