O'Brien, Margaret Mary (Monahan) on March 31, in her 72nd year. Formerly of Sheepshead Bay, Brooklyn. Mother of the late Sean Joseph O'Brien, Daughter of Margaret Mary (Summers) & the late George Monahan, sister of Maryann Izzo, Grace Campea, her late twin Patricia Maria-rossi and the late George Monahan. Also survived by her beloved Warren Fletterer. Visiting Monday April 9, 2-5 & 7-9 PM at Nolan & Taylor-Howe F.H., Northport L.I. Mass Tuesday 11AM St. Philip Neri Church, Northport. Interment Pinelawn Memorial Park. Nthfh.com