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Runners Died During Recent Half-Marathon Events

Two participants died during separate half-marathon races held in Wisconsin and the United Kingdom.

Updated on Oct. 6, 2026 in Running

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Two runners died while participating in separate half-marathon races in Milwaukee and Cardiff this week, according to race organizers. AI Illustration. Upload story photo >

Two runners have died while competing in half-marathon races in Milwaukee and Cardiff. These incidents occur as medical experts continue to study the risks associated with long-distance running events.

Why it matters

Understanding the prevalence of cardiac events during races helps participants and organizers identify underlying risks. Strenuous exercise can occasionally trigger heart issues in those with undiagnosed conditions.

A 2025 JAMA study of 29.3 million U.S. race finishes between 2010 and 2023 calculated cardiac arrest rates at 1 per 167,000 and death rates at 1 per 500,000 participants.

The players

JAMA

The Journal of the American Medical Association is a peer-reviewed medical journal that publishes original research and clinical studies.

The details

Coronary artery disease remains the most common cause of cardiac arrest in marathon runners. Other medical risks for participants include heatstroke and hyponatremia caused by overdrinking fluids.

Timeline

  1. The Cardiff Half Marathon occurred on October 4, 2026.

  2. A relevant JAMA study analyzed data collected between 2010 and 2023.

  3. Researchers published the findings on cardiac events in 2025.

Season Trajectory

These tragic events highlight the persistent medical risks inherent in competitive long-distance running. The findings from the 2025 JAMA study on cardiac arrests in U.S. racing provide a framework for assessing participant safety across the sport.

Runners should be aware that undiagnosed heart conditions are the primary driver of cardiac arrest during the 13-mile race distance. Proper hydration is also essential, as excessive fluid intake can lead to dangerous electrolyte imbalances.

The takeaway

Participants are encouraged to consult with medical professionals to screen for underlying heart conditions before undertaking endurance training. Understanding the physical limits of the body helps ensure safety throughout the training and racing cycle.

Further reading

For more information on race safety and participant health, visit Running.