Ciara Mageean, Irish 1500-Meter Champion and Olympian, Dies at 34

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. The Olympic rings were tattooed on the inside of her wrist.In June, Mageean released a book, My Greatest Race, about her cancer diagnosis. It became an all-Ireland bestseller.Mageean was sponsored by New Balance, and at times, New Balance Boston athletes would cross paths with Mageean during altitude training stints in Flagstaff, Arizona. American miler Elle St. Pierre said she admired how tenacious Mageean was, training hard even when she couldn’t run due to injury.“She was just very resilient,” St. Pierre said. “Through a number of injuries, she always came back so fast, and I feel like she she handled that mentally really well, too, and she’d still be training. That’s a really tough part of the sport, but something that really that stood out to me.”Across the elite running world, athletes took to social media to pay tribute to Mageean, who had married Thomas Moran a few weeks ago in Belfast. Mageean posted photos from her wedding on Instagram six days ago.Mark Coogan, coach of New Balance Boston, remembers enjoying a Guinness after the New Balance Indoor Games and laughing with Mageean.“I saw her more as as a friend and someone to root for than someone that we were trying to beat all the time,” Coogan said.Mageean set her mile national record in the race where Faith Kipyegon of Kenya set the world record.“I will remember Ciara as a lovely person in and out of competition,” Kipyegon wrote on Instagram. “Simply an amazing person. I wish everyone around her strength in these difficult times.”Matthias Hangst//Getty ImagesSíofra Cléirigh Büttner, who also ran for New Balance Boston and competed internationally for Ireland, plans to be in Dublin in December. She had texted Mageean just a few weeks ago to congratulate her on her wedding and suggest they have coffee. Mageean texted back, “I’d love to get coffee.”Her death, Cléirigh Büttner said, feels sudden.Mageean was a star from a young age, and instead of going to the U.S. for college and opting to run in the NCAA system, she stayed home in Ireland, with the backing of New Balance, and competed at home.When Cléirigh Büttner was deciding what to do for college, Mageean came over for dinner one night to listen and offer her advice. “She was always just a very selfless person as well as just such a driven and ambitious and talented athlete,” Cléirigh Büttner said. (She decided to go to Villanova.)“There was definitely something just very special and genuine about her, both as an athlete and a person.”Mageean was also one of Ireland’s great sporting heroes, Cléirigh Büttner said.“I think it will be a long time before the Irish nation is over this loss,” she said.Sarah Lorge Butler is a writer and editor living in Eugene, Oregon, and her stories about the sport, its trends, and fascinating individuals have appeared in Runner’s World since 2005. She is the author of two popular fitness books, Run Your Butt Off! and Walk Your Butt Off!