Article says myocarditis, side effect of Covid-19 death jabs, can cause heart attacks:
https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/has-covid-impacted-your-heart-top-cardiologists-explain-their-observations/articleshow/95547791.cms
Myocarditis can have a number of causes and sometimes can have serious effects.
So far the vaccine-induced cases have been generally mild and resolved quickly, and they haven’t resulted in any deaths.