Michael T Rooney (aka Black Mike) built the first permanent building in Billings, Montana . He was the first of the three brother to go to Montana. They first settled in Miles City, then moved to Billings, then Judith Basin. He was a contractor in freighting and ditching, and there's a big Rooney ditch above Utica, irrigating land on the south bench.
His Montana death index says he died in 1923, while his gravestone says is was 1922.