Remembered for her missionary work in Peru with the Sisters of St. Joseph of the Sacred Heart, McCormack was murdered by members of a Peruvian Communist guerrilla group.
After becoming a member of the Sisters of St. Joseph at age nineteen, she had a three-decade teaching career in her native Australia. She began her Peruvian missionary work in the late 1980s.
She was an avid amateur tennis player and golfer.
She was born in the western Australian farming town of Kununoppin, and she attended boarding school in Attadale.
She and American Protestant missionary John Birch were both executed by communist-affiliated groups.