A passionate triathlete known for inspiring her thousands of followers met a tragic end when she drowned during the swim segment of the renowned Ironman competition in Texas on Saturday.

Mara Flávia, a 38-year-old Brazilian influencer with a substantial Instagram following of over 60,000, disappeared while participating in the open-water swim at Lake Woodlands. This swim marks the first of three arduous stages in the 140-mile race.

Emergency calls began flooding into the Montgomery County Sheriff’s Office and the Woodlands Township Fire Department as early as 6 a.m., according to reports from Fox 26. Woodlands Fire Chief Palmer Buck informed Click2Houston that the alert about the “missing swimmer” was received around 7:30 a.m.

The professional female swim event commenced at 6:31 a.m., in line with the Texas Ironman schedule.

Rescue teams combed through the lake while the triathlon proceeded, a factor that Chief Buck noted complicated the search due to challenging conditions and severely limited visibility for the dive team.

Flávia’s body was eventually recovered from the lake just after 9:30 a.m., approximately three hours after she was reported missing. By that time, her body had descended 10 feet to the lake’s bottom, Chief Buck stated.

She was pronounced dead on the shore.

The sheriff’s office confirmed that the victim “drowned while participating in the swim portion of the event,” according to a statement. The office said its Major Crimes unit will continue the investigation “per normal protocols.”

An Ironman volunteer heartbreakingly detailed the “panic and fear” he and other witnesses experienced when Flávia, whom none of them knew personally, vanished underneath the water.

“They all said the same thing: She went under. Right here. Right below us,” he recounted.

He said that one veteran racer clung to the side of a kayak with “a thousand-yard stare” because “he had just watched someone disappear beneath him.”

The selfless volunteer, who originally came out to help his young daughter “experience this incredible event from a completely different perspective,” dove under enough times that he “lost count” while trying to retrieve Flávia.

During his first attempt, he “felt her body” with one foot.

“She was gone. I don’t know how to describe what that felt like. I tried again. And again. And again. I just knew I would feel her again and could grab her and pull her up,” he wrote.

He admitted that he didn’t rationalize the risks he was taking until long after Flávia’s body was recovered.

“It never entered my mind that she had already passed long ago. I just kept searching like I was going to pull her up alive,” he wrote.

The volunteer hailed Flávia for “chasing something most people only dream of finishing.”

“She showed up for it. She deserved to come out of it,” he wrote.

“To her family: we did everything we could. I am so deeply, genuinely sorry that it wasn’t enough. She will stay with me,” he added.