Another one bites the dust: https://nypost.com/2022/09/06/hiker-dies-in-fifth-grand-canyon-death-this-year/
The desert is unforgiving.
Hiking in 100 degree plus temps is usually not a good idea. Especially so if you are 59 years old.
I had one harrowing call on a south-facing hill in 90+ temps. Ran out of water, no shade, blazing hot sun. Scared me to death. That was the end of high-temp hikes for me.