A 28-year-old woman died after choking on a hot dog at a Chicago Cubs baseball game on Sunday. Maureen Oleskiewicz, 28, was attending the game at Wrigley Field in Chicago, Ill. with her brother when the tragedy occurred.

Oleskiewicz was in the process of eating a hot dog prior to the first pitch when she began choking and collapsed. Fans rushed to her aid and "performed CPR like I've never seen," according to witness Brent Olson, who spoke to the Chicago Sun-Times. Oleskiewicz was rushed to Illinois Masonic Hospital where she later died. She was a teacher at Independence Junior High School in Palos Heights, Ill.

"Maureen had a positive impact on countless students, parents...and colleagues," Kathleen Casey, the school district's superintendent wrote to parents in a letter obtained by CBS.

Oleskiewicz organs were removed for donation, and the late woman's mother, Margaret Oleskiewicz, said Maureen's "big, giving heart" would be transplanted into a 14-year old girl previously awaiting a donor.