Dennis Flannigan, age 83 of Oakmont and formerly of Aspinwall, passed away on Thursday March 23, 2023. He was the beloved husband of Estelle (Petagno) Flannigan for 64 years. Loving father of James Flannigan and Annette (John) Artzberger. Devoted grandfather to Bryan (fiancee LeighAnne) Meister, Matthew (Kara) Meister, KatieAnn (Matt) Thompson, and Hannah Flannigan. Great-grandfather of Lauren, DeniRose Meister, Michael, Brooke, and Christopher Cozzens, Everette and Ava Meister, and Estelle Thompson. Brother of James Flannigan, John (Sharon) Flannigan, and the late Edward Flannigan. Denny was a dedicated 249 Teamster Member for over 50 years. Denny's joy was the love for his family, sharing time with them, especially all his grandchildren and great-grandchildren. Friends and relatives will be received at the BURKET-TRUBY FUNERAL HOME CREMATION AND ALTERNATIVE SERVICES, INC. 421 Allegheny Ave. Oakmont, PA 15139 on Tuesday March 28 from 3-7 p.m. Mass of Christian burial 10 a.m. Wednesday at Holy Family Parish St. Irenaeus Church Oakmont. Entombment will follow at Allegheny County Memorial Park, Allison Park.