Sorry to possibly throw a spanner in.
But a rise in Blood Clots with the vaccine as a side effect.
Hagler - being a boxer (and yes, I've seen a Boxer die before my eyes from a blood clot, as he got off his stool for the next round), would be highly susceptible to Blood Clotting, especially in the head where a lot of injury has occurred (Like European Soccer players having the highest stat of Dementia later in life, in Europe: heading the ball).
This is ust a personal view and there is no evidence yet to prove that Hagler died from an exact such.
Many things have been proven as false speculation.
But many things have been proven right in speculation.
...It_is_the_Light would be beaming if they found Planet 9: Nibiru.

I posted this Topic because of what another Member said in the first post link to that Topic. I thought it might prove important. I'm not an Anti-Vaxer (except against the common colds/flu Vacs that get thrown around and even get people sacked if they don't take them) and I would take the Vaccine when the right time comes. But having seen so much 'crap' come out of Big Pharma as well, I'm as cautious as Kostya Tzuyu (who only lost to non-threatening losers, not other champions

).