What will happen after death of a person who died immidiately when a person died of heart attack?

the person will first get a severe pain while having the heart attack ofcourse, but when he dies he might go to heaven or hell and that's what I believe, but i don't know really you could kill yourself and see what will happen to you next..nah just kiddin and look don't think about death now just think about living until the last moment would come for you alright?