Mercy Sister Mary Lois (Leona) Bartnicki, 88, died Nov. 23.

Born in Milwaukee, she entered the Sisters of Mercy in Des Plaines at the age of 17.

She earned a bachelor’s degree in education from Saint Xavier University, and she taught from 1951 to 2001 in parochial elementary schools throughout the dioceses of Milwaukee and Madison in Wisconsin, and Chicago and Peoria in Illinois.

After retirement, she served as a substitute teacher for eight years.

In the summers, she taught religion classes. An athlete at heart, Sister Lois could often be found at church festivals giving lessons on how to play ring toss.