This Mathew McKeogh was not the father of Maria McKeogh (1856-1886).
Mathew McKeo was baptised 6th Dec 1853, Killucan Parish parish, son of Peter McKeogh and Ellen Cahill. The sponsors were John Dunne and Fanny McKeo [Killucan Parish Register 1853 p101]. This couple had at least 8 children:
James McKeogh 1847
Thomas McKeogh 1847-1885 m. Bridget Glynn
Mary McKeogh 1851-1927 m. Richard Hetherston
Mathew 1853-1899 never married
Elizabeth Bessie McKeogh 1855-1942 m. Michael Keegan
Michael McKeogh 1857-
Peter McKeogh 1860-1946 m. Bridget Kilmurray
John McKeogh 1865- m. Bridget Dunne
Mathew never married. He died by drowning in the Royal canal at Thomastown, aged 45, bachelor, occupation carpenter, cause of death accidental drowning [Mullingar, 1885 Oct-Dec Vol 3 page 179]. His brother Thomas who had drowned in the same canal on 7th November 1885 [Mullingar, 1885 Group ID6175474].