Kathleen P. (Collins) Costello, of Milton, formerly of Dorchester and Galway, Ireland, passed away on June 9, 2016. Born and raised in Ireland, Mrs. Costello had lived in Dorchester for 50 years prior to her move to Milton 5 years ago. The beloved wife of Patrick M. Costello, she is also survived by her devoted children Marie Donovan of Milton and Donnie Costello & his fiancé Victoria Greeke of Lynn, and her cherished grandchildren Patrick Costello & his wife Katie of South Boston and Kayla Donovan of Milton. She was the sister of Ann McAteer of Quincy, Bartley Collins of Ireland and sister-in-law of Peggy Gorman of Dedham. A Funeral Mass will be celebrated at St. Gregory Church, 2215 Dorchester Ave., Dorchester, Wednesday, June 15th at 10am. Visiting hours will be held at the Alfred D. Thomas Funeral Home, 326 Granite Ave., Milton Tuesday 4 to 8 PM. Burial in Milton Cemetery. In lieu of flowers expressions of sympathy may be made to D.A.V. National Services, 807 Maine Ave. SW, Washington, DC 2002.