Nope, the one who died now (that just feels so wrong) had a history of heart problems. A couple of years ago he had to stop playing because he had an arrhythmia or something like that. So he, at least, didn't die because of any drugs. The other player, Feher, who was also very young (24, IIRC), died due to causes unknown. IIRC, the authopsy didn't provide enough proof to say what killed him. But they know this: it wasn't drugs, either.
More details: Apparently, Bruno Baião collapsed in the cafe after receiving a phone call from his manager stating that Benfica might have wanted to renew his contract, what would give him a professional player status. I guess with his heart conditions, he just couldn't handle the emotion, I guess. Man, that's hard... Benfica's my favourite club since day 1 and it's sad to see two young, good players with potential to go like this... At least, at the Portuguese Cup finals, which happens tomorrow between Benfica and Porto, they scheduled a minute of silence to pay Bruno Baião their respects.