Margaret O'Sullivan

Margaret A. O'Sullivan

1968 - 2022

Share Your Memory of

Obituary of Margaret A. O'Sullivan

Please share a memory of Margaret to include in a keepsake book for family and friends.
Margaret A. O’Sullivan, 54, of Amherst, NY, passed away on June 2, 2022 at Erie County Medical Center. Born in Buffalo, NY, she was the daughter of Janet (Carlin) O’Sullivan and the late Patrick O’Sullivan. Margaret was a graduate of Mt. Mercy Academy and earned her Associate’s Degree from Trocaire College. She was employed as an IT Analyst with Merchants Insurance Group in Buffalo, NY. She was a member of the I.U.A.A. Parade Committee, the Buffalo Irish Center, and was a Spokesperson for Upstate New York Transplant Services. She enjoyed interior designing, shopping, attending concerts, donuts, and spending Summer Thursdays at the Irish Center. Above all, she cherished the time she spent with her children and grandchildren. In addition to her mother, Margaret is survived by her daughter, Heather (Jason) Pascall-Nagy; her grandchildren, Quinn, Connor, Caleb and Hunter, and her granddogs, Trixie and Bailey; her loving devoted companion, Peter M. Heffernan and his children, Leanne (Rick) Pilarski and Kevin (Krista) Heffernan; her siblings, Michael (Jane) O’Sullivan, Rick O’Sullivan, James (Sharon) O’Sullivan, John O’Sullivan, Stephen O’Sullivan, Noreen (late Paul) Hoeflich, and Rachel (Matt) Steinbroner, as well as many nieces, nephews, aunts, uncles, cousins, and dear friends. Visitation will be held on Tuesday, June 7 from 4 – 8 PM at Castiglia Funeral Home, Inc., 873 Abbott Road, Buffalo, NY 14220. Margaret’s Mass of Christian Burial will be held Wednesday at 11 AM at St. Teresa Church, 1974 Seneca Street, Buffalo, NY 14210. Everyone please assemble at church. Interment in Holy Cross Cemetery, Lackawanna, NY. If desired, memorial offerings may be made to the Juvenile Diabetes Research Foundation, Visit: for online condolences.


4:00 pm - 8:00 pm
Tuesday, June 7, 2022
Castiglia Funeral Home, Inc.
873 Abbott Road
Buffalo, New York, United States

Mass of Christian Burial

11:00 am
Wednesday, June 8, 2022
St. Teresa's Church
1974 Seneca Street
Buffalo, New York, United States
Online Memory & Photo Sharing Event
Online Event
About this Event
Margaret O'Sullivan

In Loving Memory

Margaret O'Sullivan

1968 - 2022

Look inside to read what others have shared
Family and friends are coming together online to create a special keepsake. Every memory left on the online obituary will be automatically included in this book.