Michael was born before 1845. He passed away in 1916.
Sources
Census, Tombstone, Book: Portrait and Biographical Record of Denver and Vicinity (1898), Family Knowledge
Marriage: "District of Columbia, U.S., Marriage Records, 1810-1953" Original data: Marriage Records. District of Columbia Marriages. Clerk of the Superior Court, Records Office, Washington D.C Ancestry Record 61404 #422718 (subscription required) Michael McMahon marriage to Mary Collison on 2 Dec 1862 in District of Columbia, USA.
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