[REVISION HISTORY]

Medical emergency of Matthew Mayich

Updated 4 times since CLSTR started tracking revisions of this situation.

What changed

2026-09-05 10:26 UTC → 2026-09-07 11:45 UTC · added ~~removed~~

On August 20, 21-year-old Matthew Mayich, a defenseman and St. Louis Blues prospect at Arizona State University, collapsed during an outdoor workout in Tempe. While initial reports suggested heat-related illness, subsequent updates indicated Mayich suffered cardiac arrest and exertional heatstroke during a military-style training session. As of early September, Mayich remains ~~hospitalized at the Barrow Neurological Institute.~~ hospitalized. His attorney, Robert Carey, has provided conflicting descriptions of his medical state; while previously reported to be in a coma, Carey stated on September 3 that describing his state as a coma is ‘no longer accurate,’ alleging the athlete’s body has ‘fundamentally ceased to function’ and his condition is irreversible. However, other reports from September 5 suggest he remains in a coma. Carey has criticized the 60-minute conditioning session as ‘grueling’ and ‘onerous,’ noting it involved high-intensity drills with minimal rest and only one water break. The family is demanding an independent investigation, alleging that Arizona State University may have violated its own heat policy. Specifically, Carey claims Mayich had been in the Phoenix area for only five days, which would have bypassed the required one-week acclimatization period. Further allegations suggest safety protocols were ignored, including a lack of immediate cooling measures like an ice bath or cold water immersion following the collapse. New details indicate the session was reportedly led by Tim Ziesel, a former Green Beret working as an external contractor, rather than a hockey coach. Arizona State University has launched a review of the incident. Athletic director Graham Rossini stated the university is ‘reviewing the facts and understanding the scenario,’ noting that coaches and trainers were present during the session.

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