Korey Stringer's 2001 Heat Stroke Death Is Why Every NFL Practice Field Now Has a Cold Water Tub

Korey Stringer collapsed during a Minnesota Vikings training camp blocking drill in Mankato, Minnesota, in 2001. He was moved to an air-conditioned trailer near the practice field, but proper diagnosis and treatment didn't happen fast enough. By the time an ambulance got him to a hospital, his core body temperature had reached 108.8 degrees Fahrenheit, according to AP News. He was pronounced dead about 15 hours after he went down. He remains the only known NFL player to die from exertional heat stroke.

Almost an hour and a half passed between when Stringer left the drill and when he arrived at the hospital, according to reporting on the case. Doctors and researchers who've studied heat stroke deaths since say that gap, and what didn't happen inside it, represents the whole tragedy.

"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," Douglas Casa told reporters. Casa is executive director of the Korey Stringer Institute at the University of Connecticut. "With a $150 tub of ice and water, these people would still be alive."

Casa didn't come to this cause as an outside academic. At 16, running a 10-kilometer race at the Empire State Games in New York, he collapsed on the final lap with 200 meters remaining, got back up, and fell again with about 80 meters to go. He was unconscious for two hours. A physician placed him in a cold water immersion tub after he reached the hospital, and quick work by an athletic trainer and EMTs before that 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."

How the Institute Came to Exist

The Korey Stringer Institute was established in 2010 as part of the settlement of the wrongful death lawsuit Stringer's family brought against the NFL. Casa connected with Stringer's widow, Kelci Stringer, and his agent, Jimmy Gould, through that litigation.

Casa now sits on the NFL's general medical committee and regularly advises the league on player safety. The mandatory presence of cold water immersion tubs next to every team's practice field is one of many protocols enhanced in the 25 years since Stringer's death, and traces directly back to the work done in his name.

"When I tell Korey's story, it takes it from such a sad, morbid place to a place of such action," Kelci Stringer said. "It's better to be proactive than reactive."

The Simple Fix Behind a Complicated Failure

The protocol that emerged from Stringer's death is blunt: cool first, transport second. That runs against instinct. The obvious move when someone collapses is to get them to a hospital as fast as possible. But heat stroke research says the opposite. Ice water immersion on-site, before the ambulance ride, is what actually saves lives, because it drops core body temperature within minutes rather than after a drive to the ER.

That's the lesson the NFL institutionalized. Every team now keeps a cold tub near the practice field.

Stringer's case exposed how thin the margin is. A 108.8-degree core temperature is catastrophic, and the medical response that day didn't move fast enough to change that outcome. The tubs now sitting next to practice fields are the direct, physical answer to that failure: a $150 piece of equipment standing between a player and the same fate, according to Casa.