Wasn't Brittany Murphy way too young for a cardiac arrest ? 2009 was the year of death for so many celebs?

I can't believe Brittany Murphy died of a cardiac arrest at 32 years old .. That's way too young. Looking back at the year 2009 , it was a dark year of so many celebrities. Michael Jackson, the one I am still mourning up to now , Farah Fawcett, Patrick Swayze and SO MANY others whose names I forgot . They were countless deaths of celebrities in 2009 it seems ... What do you think killed Britanny Murphy at 32 years of age ?? that's wayy too young for a cardiac arrest