Searching for Thomas Killeen born about 1845

Looking for any information about Thomas KILLEEN born about 1845 in either  Clare or Mayo County, Ireland.  Left Ireland about 1863-64.  Arrived in New Orleans, LA, October 3, 1867.  Died in New Orleans, July 8, 1898.  Married Elizabeth HARVEY born in Ireland (county unknown).  Children of this marriage: Thomas, Catherine, Walter Harvey.  She died before he did and he remarried about 1896 to Mary Clare O'REILLY, death before May 1967.  They had one child, Mary Clare KILLEEN. 

Also looking for any information regarding the family of Mary PURCELL born Mayo County, 1833.  Married to Joseph CALLAHAN (CALLAGHAN) born 1821, Wexford County.  Arrived in the United States 1838 (port unknown).  Date of naturalization as a United States Citizen in New Orleans, Louisiana, September 1, 1852.  Two years after marriage.  Children of this marriage:  Catherine, Ida, Mary ("Nenen").  Mary married August Wattigny, Jeanerette, Louisiana.