Donald L. Blackketter, age 88, of Watertown, Minnesota, passed away Thursday, December 5, 2019, at his home. A Mass of Christian Burial will be Thursday, December 12, 2019, at 11:00 A.M. at Immaculate Conception Catholic Church in Watertown with interment with Military Honors at the church cemetery. Visitation will be at the Iten Funeral Home in Watertown on Wednesday, December 11, 2019, from 4:00 – 8:00 P.M. with a 3:45 P.M. Knights of Columbus Rosary. Further visitation will be at the church one hour prior to the Mass. Memorials are preferred in lieu of flowers. Arrangements are by Iten Funeral Home of Watertown.