Officials tell WLS-TV in Chicago that Maureen Oleskiewicz of Orland Park was sitting in the bleachers Sunday around 12:55 p.m. when she began choking.
Ballpark staff and onsite EMTs responded and transported her to Advocate Illinois Masonic Medical Center where she died.
Oleskiewicz was a teacher at Independence Junior High School in Palos Heights.
"The Chicago Cubs are saddened to hear news of the untimely death of Maureen Oleskiewicz. We express our deepest sympathy to her family and friends. We will continue to keep her family in our thoughts and prayers during this difficult time," a Cubs news release said.
Incarnation Catholic Church in Palos Heights is hosting a prayer service Thursday at 7 p.m. in honor of Oleskiewicz, according to a statement posted on School District 128 website.
"There is no magic wand to fix what we cannot comprehend," District 128 Supt. Kathleen Casey wrote in a letter to parents. "Maureen had a positive impact on countless students, parents and & colleagues. Her vibrant, positive outlook on life and her joyful nature will be missed more than words can convey."