[citation needed] Another rival was Grain Valley High School; it ended when St. Mary's enrollment fell to 200 students.

[citation needed] Early in 2012, the diocese announced the acquisition of an 80-acre (32 ha) tract of land in western Lee's Summit for the site of a new $30 million Catholic high school.

[4] The acquisition was part of plan to replace both St. Mary's and Archbishop O'Hara High School.

Electives included art classes such as pottery, mixed media, Art 2, and drawing; music and Cantori (choir); creative writing, newspaper, yearbook, office development, introduction to business, and others.

Students participated in football, volleyball, basketball (boys and girls), baseball, wrestling, soccer, cross country, and track and field.