Man died and came back?

there was a man i saw a while ago he actually died at a young age cuz he had a heart attack at age 18 or somthing it was a heart virus and he was dead but 1 week later he came back i saw that on the news i thought there was no way but it said ppl dont no how he didnt get brain damage cuz of the oxygen but the doctor said he was lucky hmmmm thats wierd