willemvanoranje said:
I think it unlikely that it is a result of the information age.. we had an information age in the 70'ies and 80'ies as well..
But were you here in the 70s or 80s to check?

It's highly probable that in the socialist regimes of eastern Europe more athletes died or had problems, due to the heavy state sponsored doping programs.
Nowadays, the media reports what is on a high. For example, after the doping scandals in the Tour 1998 and Giro 1999, every cyclist that dies in mysterious circumstances is widely reported. But young cyclers were dieing before.
In football, the deaths of Foé and Feher during televised matches, watched by big audiences caused quite a shock, but players died in similar circumstances before, only far away from the TV cameras when the reality shows weren't yet fashionable.
I don't think there is an increase to answer the question in the thread title, but we hear about it more nowadays. For example, if I hadn't seen this thread here at CFC, I probably would never notice that there was a player called Di Tommaso, and that he died during his sleep at the age of 26. And I bet that none of you ever heard about the similar death of Pavão, the star of FC Porto in 1973, even if you were alive back then, because probably it only got a brief newspaper reference outside Portugal back then. Otoh, Lázaro, another portuguese athlete, died in the Marathon of the 1912 Olympics. Because he died in such a privileged stage, and was the first olympic athlete to die during the event, he became world famous, but if he had collapsed in a minor portuguese race, no one would have ever heard of him.
To conclude, to know about what happens in the world, someone has to report it to you. Nowadays, you can know about it from newspapers, radio, more TV channels than ever, and all the possible ways to find information on the internet, and there are more people, professionals or not, reporting whatever happens in every corner of the world.