I would imagine so. 47 is an awful young age to be found deceased in bed. My first thought was drugs and I hope that's not the case.
Most people have arteries and veins in their hearts that are blocked even to small degrees by plaque. Sometimes a piece of plaque can break off, and block an artery in the heart causing sudden death. Usually it's newly formed plaque that does this. My own arteries are blocked to 30%, but that's normal for my age. They actually have a test for that now that can determine if you have the type of plaque that is in danger of breaking off and blocking an artery to your heart.