It's weird because I just got told today that someone I knew in high school keeled over, went into cardiac arrest, and died on Friday. He was only 22 years old, 6'6" tall, and worked out a few times a week. From the desciption of how he died, it was probably either an aneurysm or an embolism that did him in. Sadly, someone else I knew who was one of my best friend's best friend died the exact same way, and he was only 27. Go back almost 7 years ago, and I lost my mother to a pulminary embolism and the thing almost happend to both my dad and grandfather except they caught it in time. Most of this stuff comes pretty much out of the blue, but you just gotta keep living and hope it does not happen again too close to home.