Mark Alan Brennan, born July 8, 1950, passed peacefully April 23, 2021, at home in the Black Hills of South Dakota, which he dearly loved. He proudly served his country in the US Army during the Vietnam era.

He is survived by his daughter, Cherie; one grandchild; his father, Richard Brennan; three brothers, Rick Brennan, Patrick Brennan, and Dale Brennan; and one sister, Maureen Mross.

He was preceded in death by his wife of thirty years, Kathy.

Private family committal service where Mark will be interred with his wife, Kathy, at Black Hills National Cemetery near Sturgis, SD,  on May 14, 2021.