Mr. Callahan was a U.S. Air Force veteran and owner of RP Callahan Plumbing and Heating. 

He was the beloved husband of Mary (Guelli) Callahan.

Loving father of Kathleen Callahan and her partner Craig Sams of Pepperell, Christine Callahan-Blair and her husband Doug of Bedford, Richard P. Callahan Jr. and his wife Winnie of Dunstable, and Colleen Poley and her husband David of Newburyport, and step-father of William P. Corbett Jr. of Bedford. Loving grandfather of Paul Hennigan, Richard Hennigan, Jason Blair, Samuel Blair, Amanda Callahan, Sean Callahan, Ryan Clark, and step-grandsons Seamus Corbett and Cannon Corbett. Brother of William J. Callahan, Beatrice Callahan, Martin Callahan, Michael Callahan, and the late John Callahan and the late Daniel Callahan. Also survived by many loving nieces and nephews.

The funeral will be on Saturday, March 10, 8 a.m., from Shawsheen Funeral Home, followed by a Funeral Mass in St. Michael’s Church, 90 Concord Road, Bedford, at 9 a.m.

Funeral home visiting hours will be on Friday, March 9, 5-8 p.m. Relatives and friends are invited.