Mary Sharon (DeJean) O’Connor


August 25, 1941 - January 30, 2023

Mary Sharon (DeJean) O’Connor passed away peacefully on January 30, 2023 surrounded by her family at the age of 81 from complications of pulmonary fibrosis. 

Visitation will be held Thursday, February 9, 2023 at St. Johns Catholic Church in Ft. Pierre, S.D. from 5:00-6:00 p.m. CST with a prayer service and Rosary to follow. Funeral services will be held Friday, February 10, 2023 at St. John’s Catholic Church at 1:00 p.m. CST, with interment following at Scotty Philip Cemetery in Fort Pierre, S.D. Mary’s service will be broadcast live at

Mary was born in Plankinton, S.D. on August 25, 1941 to Raymond and Adeline DeJean as the middle child of ten brothers and sisters. Mary graduated from Cavour High School in 1959 and continued education to become a registered nurse at St. Johns School of Nursing in Huron, S.D. where she graduated in 1962. She continued her nursing career in Huron, Black Hills Army Depot, Edgemont, State Veterans Home in Hot Springs, and the Veterans Hospital in Hot Springs until she retired in 2006. 

Don and Mary were married in 1964 and located to Hot Springs, S.D. where they were blessed with two adopted children, Cory and Brenda. She had a never stop attitude between work and all other activities including her children’s sports, 4H and all ranch activities. After her retirement, Don and Mary lived their retirement life in Fort Pierre where she began drag racing, winning many races and championships in her class. She was a very devoted wife, mother, grandmother, aunt, and friend to many.

Mary was preceded in death by her parents and brothers, Kenny, Evan, and Larry (Julie). She is survived and lovingly remembered by her loving husband, Don; son, Cory (Kim), and daughter, Brenda (Jeff-Fiancé); brothers, Donny (Donna), David (Penny), Ralph (Connie), Rodger (Judy), and Gary (Shelly); sister, Connie; two grandchildren, Shawn and Gage and numerous nieces and nephews.

Condolences may be conveyed to the family at

Fall River County Herald Star

EDGEMONT OFFICE: 410 2nd Avenue   Edgemont, SD 57735-0660 | 605.662.7201
HOT SPRINGS OFFICE: 334 S. Chicago St.  Hot Springs, SD 57747 | 605.745.3930
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