I have a heart condition called Long QT Syndrome. I was completely unaware I had this condition until I went into sudden cardiac arrest 9 times in 1 day at the age of 30 a couple of years ago. Prior to that I never had any inclination whatsoever in my entire life that I had a heart condition. These things can happen. Like another poster said though, a heart condition wouldn't result in him being buried in a shallow grave.