Kathleen Ann Lambert, 84, peacefully passed away on Monday, March 2, 2026, at the Brunswick Cove Nursing Home in Winnabow, N.C., with family by her side. Funeral services were held Monday, March 16, 2026, at 10 a.m. at St. Anthony’s Catholic Church in Culbertson, Mont., with Father Akama Ukemaide officiating. A luncheon followed services for a time of fellowship and sharing at Culbertson Town Hall in Culbertson, Mont. Visitation was Sunday, March 15, 2026, from 10 a.m. until 4 p.m. at the Fulkerson Stevenson Memorial Chapel in Sidney, Mont. Fulkerson Stevenson Funeral Home of Sidney, Mont., is assisting the family. Remembrances, condolences and pictures may be shared with the family at www.fulkersons. com. Kathleen was born on the 16th of April, 1941, to her loving parents Thomas Corbett and Virginia Italia Carlotto and raised with her sister Mary Beth in Crystal Falls, Mich. She lived a life focused on two passions, her children and students. She taught mathematics for over 30 years in Culbertson and Brockton, Mont., touching hundreds of young lives. She was never happier or more at home than in front of a classroom where she made the impossible seem easy. Her brilliant mind mixed with a sharp wit and easy laugh made her a favorite for so many. Perhaps no one felt the depth of her love and fierce loyalty more than her three sons. She was their greatest champion and gave them everything she had. She will be deeply missed. She is survived by her three sons and their families: Chris May, wife Leslie and son Colton; Thomas Rumsey, wife Holly and their children Jennifer, Joshua and Jacob; and Abe Rumsey, wife Tessa, daughter Lauren and son Izack. She will be welcomed in Heaven by her husband, Dennis Lambert; Tom and Virginia Corbett; and sister, Mary Beth Thompson. The family would like to thank everyone who has been so kind to us through this very difficult time. Please know she passed peacefully and was very much looking forward to being back with Dennis. Remember her laugh … and you will remember her. (Paid Obituary)