Cases of heart attack, as far as I know, have occurred more than once and almost casinos have experienced users such as health symptoms, that's almost the average casino or traditional gamblers like chicken gambling have ever happened to those who try to gamble at an advanced age, that's nothing new to my knowledge.
Example:
SUKKUR: A cockfighting gambler suffered from a severe heart attack and died after the cock, on which he put his stake lost in a fight near Gharo city, District Thatta on Sunday. Shahid Ali, a fan and gambler of cockfighting, bet on one of the cocks. However, his favorite cock lost the battle and Shahid was obliged to pay Rs100,000 as booty to the winner of the bet.
However, for that overall the doctor or medical provided by the casino, I think it's a little contrary to medical law, they can only practice in legal places such as clinics, hospitals and those related to health, casinos/gambling venues I think most of them are illegal, it's a violation if a medical team is placed there, maybe if it's a medical call I think there is, of course they don't treat patients in the casino, they take them to the hospital if there is a health problem that happens in the casino.
If you ask who is at fault, of course the user is at fault, who told him to gamble, already knows he has a heart history, why does he keep going to the casino, he's looking for disease.