I don't know if this is your guy, but a Michael Shea married Abbia Cahill on Sept. 24, 1845. Fr. Moore united them. ( Fr. Gibson did not perform any marriages that month. Fr. Moore and Fr. McAvoy/McEvoy seem to have covered for him for the four marriages that month.) Jerry Ciran ?? and J. Hemmining witnessed.
I don't know how old he was or anything about the one that died in 1877, but it is not hard to imagine that a marring-age man in 1845 died in 1877.
John