How Korey Stringer’s Death Made Cold Water Tubs Standard at Every NFL Practice Field

EAGAN, Minn. — Korey Stringer’s death from heat stroke in 2001, after he collapsed at a Minnesota Vikings training-camp practice in Mankato, Minnesota, remains the only known case of an NFL player dying from exertional heat stroke. A quarter-century later, the changes it triggered are visible at every team’s practice facility: cold water immersion tubs are now mandatory sideline equipment, ready to be used the moment a player shows signs of overheating.

The through-line of those reforms, reported by AP’s Dave Campbell, is a simple principle: cool first, transport second. Stringer’s case shows what happens when that principle is not applied in time.

A deadly timeline in Mankato

Stringer exited a blocking drill during training camp on the morning of July 31, 2001, and collapsed. Almost an hour and a half passed before he arrived by ambulance at a hospital with a core body temperature of 108.8 degrees Fahrenheit.

According to the AP report, he was moved to an air-conditioned trailer by the practice field during that window, but the lack of effective diagnosis and treatment by the team’s medical staff made his outlook all the more dire. About 15 hours after he collapsed, Stringer was pronounced dead.

Why ‘cool first, transport second’ became the rule

The phrase belongs to Douglas Casa, executive director of the Korey Stringer Institute at the University of Connecticut. Casa, who sits on the NFL’s general medical committee, argues that rapid cold water immersion is the single most effective intervention for exertional heat stroke.

“With a $150 tub of ice and water, these people would still be alive,” Casa said, speaking about the 85 heat stroke death cases he has reviewed as an expert witness. “I’ve been an expert witness in 85 court cases of people dying from heat stroke, and in every single one the person didn’t need to die if they were properly treated and cooled.”

Casa’s conviction comes from personal experience. At age 16, he collapsed on the final lap of a 10-kilometer race at the Empire State Games in New York, got back up and fell again with about 80 meters to go. He was unconscious for two hours. A quick-thinking physician placed him in a cold water immersion tub after he reached a hospital, and the on-site care from an athletic trainer and ambulance EMTs gave him a chance to survive.

“If Korey had gone in a cold immersion tub, we would not be chatting right now,” Casa said. “He would’ve had dinner with his teammates that night.”

From a lawsuit to the Korey Stringer Institute

The institute that now carries Stringer’s name was established in 2010 at UConn as part of the settlement of the wrongful death lawsuit Stringer’s family brought against the NFL. Through that litigation, Casa connected with Stringer’s widow, Kelci Stringer, and agent, Jimmy Gould.

The institute conducts research on heat illness prevention and treatment and has become a reference point for sports safety at every level, from youth leagues to professional teams.

What the NFL changed after Stringer’s death

Cold water immersion tubs are now a mandatory presence near the practice fields of every NFL team, according to the AP report. The mandate is one of many protocols enhanced in the 25 years since Stringer’s death, and it can be traced directly to the work done in his honor.

The reforms go beyond equipment. Emergency action plans, heat acclimatization schedules and staff training on recognizing exertional heat stroke all stem from the same period of review that followed the

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