User blog comment:Suriken88/Ezio's speculated death in Embers/@comment-3183702-20111219103719

You know... poison can actually accelerate/trigger an heart attack. He was already old and sick and probably on his way out yeah, but just a small bit of poison would probably be enough to die even sooner in that state... I think there's no 100% way to be sure he wasn't poisoned in my opinion. It's up for debate and I think it will always be, ufortunately.

Poisoned or not, there's no doubt the guy sitting next to him was a Templar... http://assassinscreed.wikia.com/wiki/File:Templar_Embers.png

Plus I didn't like the face he makes to Ezio when he's dying, with his smug-smile, raising his left eyebrow... and that ugly scar. To me he sounded really sarcastic when saying "Coraggio, vecchio (Courage, old man)" and "Get some rest, uh?". And "vecchio" sounds derogatory. "Anziano" would be more polite.