David O'Neill Obituary

We announce the death of David O'Neill of Cascade, Montana, who passed away on June 18, 2026, at the age of 67. David will be remembered by family members, friends, and others whose lives were connected in meaningful ways. Leave a sympathy message to the family on the memorial page of David O'Neill to pay them a last tribute.

He was predeceased by: his parents, Patricia O'Neill (Scally) and Wallace O'Neill; his grandparents, Henry, Isabelle Scally, William and Peggy O'Neill; and his brothers, John and Mike O'Neill.

He is survived by: his wife Jane Wilson-O'Neill; his stepsons, Corey and Zack Grayson; his siblings, Matt O'Neill (Evonne), Marcie Dardis (Barry) and Renie O'Neill (Johnna); his sister-in-law Laura O'Neill; his nephews, Casey O'Neill (Rachel), Mark Dardis (Shannon), Brian Dardis (Erika), Kyle Dardis (Tracy) and Ryan Dardis (Liviya); his niece Tiffany Sivertsen (Jamie); his great-niece Addison O'Neill; and his great-nephew Tate O'Neill.

Donations in his name may be made to Great Falls Vets4Vets.