Dorothy Ann Oliveira

November 11, 1947 - July 14, 2025

Dorothy Oliveira passed away in Helena, Montana on July 14, 2025 due to cancer. She was born Dorothy Ann White in Sheridan, Wyoming on November 11, 1947 to Melvin R and Nancy H. White at the Reynolds Home. At the time her father was working for O'Dell and Arney at a ranch near Dayton, Wyoming. The family lived in an apartment on the Main Street of Dayton in a building now known as White Horse Bed and Breakfast. In March of 1948 when Dorothy was four months old the family of three moved to the Half-Way Lane between Ranchester and Dayton to what was the beginning of the White Ranch; their address became Ranchester. Second, third, and fourth generation members of the family continue to live and work on the ranch today. Before Tongue River Schools were consolidated from Dayton and Ranchester Public Schools along with a number of rural schools, Dorothy attended Ranchester Schools in a small building in Ranchester which housed grades 1-12. After school consolidation, she attended Tongue River Schools and graduated with the class of 1966. She attended Black Hills State College in Spearfish, South Dakota for two years and graduated from the University of Wyoming in Laramie in 1970. During her senior year in Laramie, she applied for a job teaching in Hawaii and moved to Hilo, Hawaii in August of 1970. She and George Oliveira were married May 26, 1973 in Hilo and soon moved to Bellingham, Washington. They raised their children there, and Dorothy spent many years volunteering in their children's school and with other activities and being a 4-H leader. She returned to working in education, and when she and George moved to Gillette, Wyoming, in 2002 she continued working in education. In 2008 they moved to Helena, Montana. In 2009 and 2013 their granddaughters Hayden Lee and Hattie Irene were born in Helena, and it was time with them that Dorothy would tell you was her best gig in life. While in Helena, she was involved with the Daughters of the American Revolution and the US Daughters of 1812 which tied in with her life-long interest in family genealogy.

In addition to her parents, Dorothy was predeceased by her daughter Nancy Leilani Oliveira in 2017. Her brother Claude Hillis White died in 1982. Dorothy is survived by her husband of 52 years George Oliveira, her son Christopher and his wife Madalyn, her granddaughters Hayden and Hattie, all of Helena, Montana. Her sister Alice White lives in Sheridan, Wyoming, and her brother Bill White at Ranchester, Wyoming. She has 6 nieces and nephews, and 9 great nieces and nephews. She is survived by her sisters-in-law Penny Oliveira and Adeline Oliveira, both of Hilo, Hawaii.

The family will hold a private viewing. Dorothy will be buried in a private burial in Helena, Montana next to her daughter Nancy.