So I try to research about deaths of boxer inside the ring,
https://en.wikipedia.org/wiki/List_of_deaths_due_to_injuries_sustained_in_boxingAnd i guess this is what the rounds was readjusted in the 80's. Before boxers fought at 15 brutal rounds but was reduced to the standard that we are using today at 12 rounds.
The infamous fight that comes to my mind is Mancini vs Duk Koo Kim who collapsed in the ring and die. Then after several months the one that referee the fight committed suicide and so is Kim's mother. And it still haunts Mancini up to this day.
Did he literally died inside the ring? I mean dead on the spot?
AFAIK, boxers or fighters from different types of combat sports don't really die inside the ring, but will brought to the hospital first and then eventually die.
Fighters however already knew this might happen to them, especially when they're hit somewhere that'll put them in a comatose state.
If luckily they survive the heavy punishment all throughout their fighting career. Side effects will eventually surface once they're getting older and older.