What we don't know is why it was not detected.
"Frequently it will not show up unless there have been some symptoms that cause the doctors to look further," said Dr. Michael Gold, the head of cardiology at MUSC.
Some symptoms include shortness of breath, chest pains or an irregular heartbeat.
He says when athletes die young you can normally point to an enlarged heart.
Gold says the heart is like any other muscle, the more you work out the bigger it can get, which may explain why athletes are often affected.
"It turns out to be the leading cause of sudden death in people under the age of 35 and certainly in competitive athletes it's the leading cause of sudden death," said Dr. Gold.
While prominent athletes get all the press, it's a condition that can affect anyone - especially if there is family history.
"Hypertrophic cardiomyopathy is a genetic condition that you're born with an abnormal gene that causes the heart to thicken inappropriately," said Dr. Gold.
That said, it's not very common which Gold says is an issue in detection.
"About 1 in 500 people have this which is part of the problem, it's not very common so it's very hard to screen or identify," said Dr. Gold.
So what do you do? If it's hard to detect how can you make sure your heart is ok?
In this case your future could depend on your families past.
"If there is a family history of blackout spells or unexplained death they certainly should call that to the attention of their doctor," said Dr. Gold.
Being better safe than sorry could lead to medication or surgery to unsure a longer life.