Margaret O'Neill Sumner's obituary , Passed away on February 20, 2026 in Greenwich, Connecticut
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Margaret O'Neill Sumner

June 4, 1964 - February 20, 2026 (61 years old)

Greenwich, Connecticut

Margaret O'Neill Sumner's obituary , Passed away on February 20, 2026 in Greenwich, Connecticut
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Funeral arrangement under the care of
Leo P. Gallagher & Son Funeral Home

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Margaret O'Neill Sumner

June 4, 1964 - February 20, 2026 (61 years old)

Greenwich, Connecticut

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Margaret O'Neill Sumner Obituary

With solemn hearts, we announce the passing of Margaret O'Neill Sumner (Greenwich, Connecticut), whose presence will be deeply missed, having departed on February 20, 2026 at the age of 61. Family and friends are welcome to leave their condolences on this memorial page and share them with the family.

She was predeceased by: her father John T. O'Neill; and her nephew Henry "Hank" McWilliam of Rye, NY. She is survived by: her mother Anne O'Neill of New Rochelle; her siblings, Jeannie Loferski (Michael Loferski), Catherine McWilliam (James McWilliam), Sheila O'Neill (Kerry Metz), Tricia O'Neill (Nick Mulford), Timothy O'Neill (Krystin O'Neill), Sophia Baskin (Brett Baskin), Peter Loferski, Charlie Metz, Cate McWilliam, Maddy, Julia and Anna O'Neill; and her great-nephew Beau Baskin.

In lieu of flowers, Maggie requested donations to the FDNY Foundation.

Funeral arrangement under the care of
Leo P. Gallagher & Son Funeral Home

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Thu

Mar 05

Funeral Mass

Church of the Resurrection
910 Boston Post Rd, Rye, NY 10580

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