The details are still a bit scarce on this Nova Scotia fatality reported in the Chronicle Herald, but it sounds like a 40-something cyclist who was riding in 30C weather has died after having some kind of medical emergency.
The assumption might be that heat exhaustion precipitated a heart attack. The rider was found dead in the ditch near Kentville, N.S. on Monday, with his bike nearby.
There are plenty of warnings being given about over-exertion in this heat wave, but it doesn't hurt to restate: hydrate.