Mary Louise Witt, 72, De Pere, passed away at home on Sunday, February 23, 2020. She was born to Helmer O. and Ruby V. (Dunnum) Knudson on November 11, 1947 in Viroqua, Wisconsin. She graduated from Viroqua High School in 1966. Mary received a B.S. Degree in Elementary Education from Wisconsin State University-Plattville (now UWP) in 1970, where she was a member of Gamma Phi Beta sorority. She began her teaching career at Rock Springs, near Reedsburg. She then moved to Janesville where she substitute taught, from there she moved to Green Bay where she taught 1st graders, her passion. Mary enjoyed playing golf with her friends in two different leagues during the summer. She also loved the Green Bay Packers, Milwaukee Brewers, and a good meal at a supper club. She was proud of her Norwegian Heritage, could speak some of the language, loved lefse, Norwegian sweets, but not so keen on lutefisk. A few years ago, she was able to take a trip to Scandanavia, getting to visit Norway, which was a dream come true. Mary is survived by the love of her life, her son, Ryan of Minneapolis, Minnesota; brother Harlan (Pat) Knudson of Dixon, IL; nephew Peter (Susie) Knudson; great niece Sophia and great nephew Brooks Knudson of Dixon, IL; nephew Alan (Beth) Knudson, great niece Annabelle and great nephew Michael Knudson of Arlington Heights, IL. Mary was preceded in death by her mother and father. The services for March 21, 2020 have been cancelled. New service times will be announced at a later date. Burial will take place in Sparta, WI.