4 were listed as in critical condition and I'd think if it were dehydration or heat you'd be unable to continue running long before you'd put yourself in critical condition.
It's hard to say. People can and do die while running. It can be a bit of a shock to the system if your body isn't prepared for the conditions or stress. I searched for another example and found a 2013 half marathon in Tel Aviv (obviously much hotter) with a similar number of casualties. https://archive.ph/hqgTN
An Israeli soldier died of heat stroke while running the Tel Aviv [half] marathon on Friday while four were hospitalized in critical condition.
...
Fifty runners were treated in a tent set up on the course, Haaretz wrote, mostly for heatstroke and dehydration, and of the 32 taken to the hospital some were unconscious and on respirators.
4 were listed as in critical condition and I'd think if it were dehydration or heat you'd be unable to continue running long before you'd put yourself in critical condition.
It's hard to say. People can and do die while running. It can be a bit of a shock to the system if your body isn't prepared for the conditions or stress. I searched for another example and found a 2013 half marathon in Tel Aviv (obviously much hotter) with a similar number of casualties.
https://archive.ph/hqgTN