Thomas J. Olson age 79 of Seneca passed away on Saturday February 22, 2020 at his residence in Seneca after a long battle with cancer. He was born on February 3, 1941 in Utica Township, the son of Tilmon and Minnie (Munson) Olson.A Mass of Christian Burial will be Saturday, February 29, 2020 at 11 a.m. at St. Patrick’s Catholic Church in Seneca, Reverend Zacharie Beya officiating, with burial in the church cemetery. Military Honors will be accorded graveside by the American Legion Post 308. Friends may call the church on Friday February 28, 2020 from 4 p.m. to 7 p.m. The Garrity Funeral Home of Prairie du Chien is assisting the family. www.garrityfuneralhome.com.