Ciara Mageean, an Irish runner who set national records in the 800 meters, mile, and 1500 meters, died November 1, according to a social media post from her family. She was 34.

Mageean was diagnosed with stage 4 bowel cancer in May 2025.

She competed in two Olympics, in 2016 and 2021, in the 1500 meters, but she could not race at the Games in 2024, due to an Achilles injury.

The timing of that injury was unfortunate, because from 2023 to early 2024, Mageean was at the height of her powers.

In 2023, she ran personal bests in the mile (4:14.58) in June and 1500 meters (3:55.87) in September. That PR came en route to a victory at the Brussels Diamond League meet. In May of 2024, she ran 1:58.51 for 800 meters and the next month, she won the European Championships 1500 meters. Her final professional race was a Diamond League 2,000 meters in July 2024 in Monaco.

Mageean announced her cancer in a July 2025 post on Instagram , in which only her right arm, hooked up to a tube, was visible.…