Ciara Mageean, an Irish runner who set national records in the 800 meters, mile and 1500 meters, died on November 1, according to a social media post from her family. She was 34. Mageean had been diagnosed with stage 4 bowel cancer in May 2025.
Mageean competed in the 1500 meters at the Olympics in 2016 and 2021, but an Achilles injury kept her out of the 2024 Games. The injury came after a strong stretch: in June 2023 she ran a personal best of 4:14.58 in the mile, and in September 2023 she ran 3:55.87 for 1500 meters en route to winning the Brussels Diamond League meet. In May 2024 she ran 1:58.51 for 800 meters, and the following month she won the European Championships 1500 meters. Her final professional race was a Diamond League 2,000 meters in Monaco in July 2024.
She announced her cancer in a July 2025 Instagram post in which only her right arm, connected to a tube, was visible; Olympic rings were tattooed on the inside of her wrist. In June she released a book, My Greatest Race, about her diagnosis. It became an all-Ireland bestseller.
Tributes came from across the elite running world. American miler Elle St. Pierre said she admired Mageean’s tenacity, noting that Mageean trained hard even when injuries prevented her from running. “She was just very resilient,” St. Pierre said. Mark Coogan, coach of New Balance Boston, remembered sharing a Guinness and laughing with Mageean after the New Balance Indoor Games. “I saw her more as a friend and someone to root for than someone that we were trying to beat all the time,” Coogan said. Faith Kipyegon, who set the world record in the race where Mageean set her Irish mile record, wrote on Instagram: “I will remember Ciara as a lovely person in and out of competition. Simply an amazing person. I wish everyone around her strength in these difficult times.”
Mageean had married Thomas Moran a few weeks ago in Belfast, and she posted photos from her wedding on Instagram six days ago. Síofra Cléirigh Büttner, who also ran for New Balance Boston and competed internationally for Ireland, said she had texted Mageean a few weeks ago to congratulate her on the wedding and suggest coffee. Mageean replied, “I’d love to get coffee.” Cléirigh Büttner said Mageean’s death feels sudden.
Cléirigh Büttner also recalled Mageean coming to dinner to listen and offer advice when she was deciding what to do for college; Cléirigh Büttner chose Villanova. Mageean had stayed in Ireland rather than going to the U.S. for college and the NCAA system, competing at home with New Balance’s backing. Cléirigh Büttner called her “very selfless” as well as driven, ambitious and talented, and said Mageean was one of Ireland’s great sporting heroes. “I think it will be a long time before the Irish nation is over this loss,” she said.
Sources: Runner's World.