all of the suspicion people are displaying around this is really ugly
Yeah, journalists who were actually there said he collapsed in his chair and the Qatari paramedics treated him immediately. I'm sure his brother's video isn't helping, but that's a grieving relative and many of the people displaying ugliness likely don't care for his brother anyway. Our government will get his body and do a full autopsy, but I'm guessing the Qatari government didn't use some super spy methods to force Grant to collapse in his chair while in a press box with dozens of other people, surrounded by 80,000 more.
This is sad as hell though, he was a great journalist and by all accounts, a great dude.