Theresa R. Ducheneaux, 90, of Eagle Butte passed away Saturday October 24, 2026, at Medicine Wheel Village, Eagle Butte.

A memorial service will be 11:00 a.m. MST, Saturday, November 7, 2026, at St. John’s Episcopal Church, Eagle Butte. Visitation will be one hour prior to the service.

Theresa Rose LeBeau Ducheneaux was born on January 24, 1936, at the Old Cheyenne River Agency Hospital. She was the firstborn child of Lloyd and Helen (Azure) LeBeau. She grew up along the Moreau River and attended Old Agency School during her high school years. She was a good student who enjoyed participating in many school activities, especially being a member of the school’s Quadrille team.

After graduating from high school, Theresa attended Black Hills State College for one semester before transferring to Haskell Indian Junior College in Kansas. In 1955, she was united in marriage to Eugene “Toby” Ducheneaux. Eight children were born to this union: June, Rosemarie, Clint, Darin, Bruce, Boyd, Lisa, and Pete.

Theresa began her career outside the home in 1956 and held many clerical and secretarial positions throughout the years. In 1986, at the age of 50, she began attending Presentation College to pursue a nursing degree. She graduated in 1989 with her Bachelor of Science in Nursing (BSN) and became a Registered Nurse. She worked for the Indian Health Service (IHS) in Eagle Butte, South Dakota; Belcourt, North Dakota; and finally, San Carlos, Arizona, where she remained until her retirement in 2001.

After retiring, Theresa moved back to the family ranch in Blackfoot, South Dakota. She later moved to the Manor in Eagle Butte. In 2013, she decided to make one final move to Medicine Wheel Village, where she resided and remained the last original resident at the time of her passing.

Theresa enjoyed sewing, crocheting, crafting, and playing cards and board games, especially Scrabble with family and friends. She was a wonderful cook, and many of her dishes remain family favorites to this day. She was strong when she needed to be, yet gentle and generous at heart. She always strived to do what she believed was best for her children and the rest of her family.

Theresa is dearly loved and will be forever missed by her eight children: daughters, June (Randy) Tvrdik, Rosemarie (Bob) Green, and Lisa (Preston) Maynard; and sons, Clinton, Darin, Bruce (Eva), Boyd, and Pete Ducheneaux; 14 grandchildren; 13 great-grandchildren; and four great-great-grandchildren. She is also survived by her brother, Wesley (Maida) LeBeau; her sister, Patsy (Virgil) Hertz; and many nieces, nephews, and cousins.

She was preceded in death by her parents, Lloyd and Helen LeBeau; two brothers, Stuart and Bruce; two grandsons, Travis and Charlie; one granddaughter, Tess; and two great-grandsons, East and Cetan “Sonny.”

The family of Theresa would like to extend their heartfelt thanks to the staff at Medicine Wheel Village for the kindness they have shown her throughout the years. She loved living there and getting to know all the staff, as well as enjoying the many conversations and stories about your lives that you shared with her. We will be forever grateful for your time, your presence, and your patience.

Luce Funeral Home of Gettysburg has been entrusted with Theresa’s arrangements.

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