Mara Flávia Araujo, a Brazilian fitness influencer, died during the swim portion of Saturday’s race, according to officials. Her death remains under investigation, but early details point to the swim—widely considered the most dangerous segment of triathlons—as the site of the incident.

While fatalities in triathlons are rare compared to the number of participants, they are not unheard of—particularly in open-water swims. 

Flávia’s death is not the first tied to the local race. In 2017, 54-year-old Glen Bruemmer died after suffering a medical emergency during the swim segment of the race, as reported by The Woodlands Online. Bruemmer had participated in 35 competitive races over 14 years, including seven triathlons, prior to his death.

“It was just so unexpected,” his son Matthew told The Woodlands Online at the time. 

Since 2020, at least 35 named athletes have died during Ironman-branded races worldwide, according to media reports reviewed by Chron. Most of those deaths occurred during the swim leg, though not all official causes of death have been publicly confirmed.

Ironman did not immediately respond to Chron’s request for comment by the time of publication.

Fatalities during triathlons are rare relative to overall participation, but they have occurred in Ironman events globally. Research on triathlon safety has found that medical emergencies are most often reported during the swim portion.

As the investigation into Araujo’s death continues, as is typical for drowning incidents in Montgomery County, her loss is being felt deeply by those who knew her and by a wider endurance-sports community reflecting on athlete safety.

“In a race setting, always stop at the first sign of a medical problem,” the organization wrote on its website. “The IRONMAN Competition Rules allow for competitors to stop or rest at any time during the swim.”