Mary Greene Poston, a Great Falls resident, 85, died of natural causes Saturday, May 7th, at New Hospice of the Valley in Surprise, AZ. Mary was born on August 11, 1925 in Aitkin, MN to Roy and Agnes Tiffany. After graduating from Aitkin County High School, she went on to graduate from Abbott Hospital School of Nursing in 1946. Mary spent the majority of her career as a surgical nurse for Dr. David McKay. She also served as Worthy Grand Matron of Eastern Star in 1958 and was a member of Daughters of the Nile Sapphira Temple Dancers. Mary was happily married to Don Greene from 1945 until his death in 1989. They divided their retirement years between their home on the Missouri River in Wolf Creek Canyon and Yuma, AZ. Mary loved entertaining friends and family and it was often said by friends, "All roads lead to Mary's house." The fulfillment of her life was the enjoyment of her four grandchildren and her five great-grandchildren. On her 70th birthday she married Phil (Spud) Poston in Great Falls, MT. She and Spud enjoyed an overseas trip to Scotland and traveling through the Northwestern United States. Spud preceded her in death on April 3rd 2011 in Yuma. Mary is survived by her son, Rick (Darcy) Greene of Peoria, AZ; daughter, Kathy (Hubert) Gilliland of Great Falls; grandchildren, Lee (Carrie) Gilliland of Great Falls; Chad (Andrea) Gilliland of Hillsboro, OR; Tiffany (Matt Wilma) Greene of Bellevue, WA; and Rory Greene of Surprise, AZ; great-grandchildren, Paige and Logan Gilliland, Alayna and Peyton Gilliland, and Kellen Wilma.Memorial service is 3:00 p.m. Friday, May 20th at First Congregational United Church of Christ 2900 9th Ave S. Memorials can be sent to First Congregational UCC or New Hospice of the Valley 14066 W. Waddell, Surprise, AZ 85379.