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The Life Time Miami Marathon, one of the most iconic sporting events in South Florida, was overshadowed by grief after the death of a participant was confirmed this Wednesday.
Julien Autissier, a 33-year-old man of French origin and resident of Boca Raton, passed away on Sunday, January 25, after experiencing a medical emergency while running the 26.2-mile (42 kilometers) race.
Authorities reported the incident three days later.
According to a report from the Miami New Times, Autissier collapsed around the 30-kilometer mark of the route, having completed approximately three-quarters of the circuit. He was urgently transported to Mercy Hospital, where he passed away shortly thereafter.
An unexpected death
Autissier was not an improvised runner. Just a few weeks before the marathon, he had completed a challenging trek through active volcanoes in Guatemala with his wife.
They climbed Acatenango at night, a stratovolcano standing 4,000 meters tall, and subsequently faced the steep Volcán de Fuego.
"When we went hiking, I was the one who led the way. He was very strong and fast," said his wife Nathaly Macomber, 41, to the mentioned outlet.
For her, the death of her husband is incomprehensible. "I never would have thought this could happen to him," she stated.
Macomber explained that her husband had no known health issues or heart problems.
He was an active man, disciplined in his training, who did not take prescription medications and rarely resorted to over-the-counter drugs.
“Julien was a very affectionate person. He would always ask me, ‘Did you eat? Do you need anything?’ He would go to the store and buy me things I hadn’t even asked for,” added the widow, visibly affected by the lack of official information about what had happened.
It ensures that, despite its attempts, it has not been able to obtain the hospital medical records or a police report detailing the exact circumstances of the collapse.
Version from the authorities
Lieutenant Pete Sánchez, spokesperson for the Miami City Fire and Rescue Department, confirmed that Autissier was “transported to Mercy Hospital from the race after experiencing a medical emergency.”
He added that he was treated in critical condition. However, invoking medical privacy laws (HIPAA), he declined to provide further details.
For its part, the Miami-Dade County Medical Examiner's Office stated that the autopsy report is still pending and that the cause of death has not been officially determined.
A possible "sudden cardiac arrest" is being considered as a preliminary hypothesis.
A spokesperson for the Miami Police Department did not respond to media requests for comments.
Reaction of the event organizer
The company Life Time, organizer of the marathon, issued a statement expressing its sorrow over the passing of Autissier and offered condolences to his family.
"The death of Mr. Autissier at our Miami Marathon is deeply felt, and our thoughts are with his family and loved ones during this incredibly difficult time," they stated.
They also emphasized that the event was held in accordance with longstanding “medical, safety, and meteorological protocols,” and that an internal review of what happened has begun.
"As with any serious incident, we will carefully review what happened to ensure we support the safety and well-being of our athletes," they assured.
First death in the history of the Miami marathon
Everything suggests that this would be the first death in the 24-year history of the Life Time Miami Marathon, according to records consulted by the Miami Herald.
The event, which brings together thousands of national and international runners each year, kicked off this 2026 from the Kaseya Center in downtown Miami, and passed through some of the city's most iconic landscapes, such as the MacArthur Causeway.
The tragic death of Julien Autissier has caused shock among both the sporting community and the organizers and spectators of the event.
The case also raises questions about the medical care protocols and health monitoring in high-demand endurance competitions.
A dedicated husband and a loving stepfather
Julien Autissier was born in France, met Nathaly Macomber in Miami, and they married in Amsterdam in 2019. She describes him as a man devoted to his family, a stepfather who helped his stepchildren with their homework and drove them to and from school every day.
He maintained a close relationship with his extended family, including his 96-year-old grandmother in France.
Amidst the pain, Macomber continues to seek answers about her husband's death. For now, the only certainty is the loss of a young, active man beloved by those around him, who left this world at the height of his life, doing what he was passionate about.
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