Fabrice Muamba would be an example of the latter.
LONDON, England – Bolton Wanderers Fabrice Muamba woke up yesterday and managed to talk to his fiancée Shauna Muganda.
Muamba, 23, suffered a cardiac arrest in Saturday’s FA Cup match at Spurs. His heart reportedly stopped beating for seven minutes and doctors carried out numerous cardiac massages before it started pumping blood on its own again.
He of course, recovered but I'm sure has stopped playing the game.
They must have stepped up testing in England/UK over this. This now has not happened in a while. I know it happened to some of the "lower-level" clubs.
For the record, Muamba offered very religious Christian-type of gratitude for recovering.
There was a recent one with Rich Peverley of the Dallas Stars, they ended up stopping the game, and rescheduled it. Fortunately, he survived. But his playing days are probably over.