(messed up the title, I obviously meant HEART attack)
No source though, but these guys are pretty reliable.
https://www.facebook.com/LaEsquinaNeutral/photos/a.250109205042063.78606.249915755061408/776270139092631/?type=1&theater
"El famoso entrenador Ignacio Beristain se encuentra hospitalizado, en teoría sufrió infarto, informaremos al tener mas detalles."
"Famous trainer Ignacio Beristain is currently hospitalized, in theory he suffered a heart attack, we'll keep you up to date when we have more info."
Speedy recovery to him if true. At his age, this likely means the end of his career, and possibly Marquez' as well.
"Relatives of Beristain confirm he had a stomach infection. Deny heart attack."
Well that's good. Hopefully that infection isn't serious; Nacho needs to lay off those burritos.
Read this online
Familiares de Nacho Beristain confirman que tuvo infección estomacal. Desmienten infarto. via@boxmanoficial
That's good news, I guess. I figure it's not as serious as a heart attack, nor career threatening.