My father's death certificate says that he died from "respiratory arrest due to acute heart attack". My father was a smoker and was overweight. According to my mom, he fainted in the store and called her to pick him up, he refused to go to the hospital and wanted to sleep it off and told her to leave him alone. he went to sleep, and when my mother went to check on him hours later, he was found dead. I want to know what exacty happened? did he feel it? was he awake? he was only 48.