Found this ...
... As CBS2’s Thalia Perez reports, police have identified the man as David Reichman, of Brooklyn, and are still investigating what caused him to collapse at the finish line. ..
https://www.msn.com/en-us/news/crime/brooklyn-half-marathon-runner-dies-16-hospitalized/ar-AAXzcCy
Sounds like he/others couldn’t take the heat.
I wonder if there are often this many casualties/collapsers.
mandatory vaccines for the race