사망하다 = die in sino korean (hanja). Would certainly be offered in official reporting favor news reports and also articles.
숨지다 = accurate "lost their breathing". A polite method of saying someone died, usually provided in news or other formal situations.
돌아가시다 = accurate "went back". A polite, colloquial method of speak someone died.
떠나다 = accurate "left". A more ambiguous and also careful way to say someone died.
눈감다 = close up door eyes
목숨을 잃다 = lost life
there are a bunch more ways to say who died