Seth Bullock

Born near the Detroit River in Ontario, Canada, Seth Bullock eventually moved West and served as sheriff in several locations in Montana before ending up in Deadwood, South Dakota.  Having initially gone to Deadwood to exit the sheriff business and start a hardware store, he found himself serving as the town's appointed sheriff.  Along the way, he was present at the founding of Yellowstone National Park and became a personal friend of Theodore Roosevelt.  There's lots more, but I don't have room for it all here.  Check out his wikipedia bit at: https://en.wikipedia.org/wiki/Seth_Bullock

Here he is later in life, still with the prodigious mustache: