Arthur John Rosier (October 31, 1880 – April 15, 1932) was an American lawyer and politician who served in the Wyoming Senate from 1927 until his murder in 1932. Rosier was a member of the Republican Party and represented Carbon County in the legislature. He was also a prominent lawyer in Montana and Wyoming, and took part in several noteworthy trials. Prior to his political career, Rosier was the prosecuting attorney for Carbon County from 1916 until 1920.
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