I was in a Singleplayer-Hardcore game. My telephone rang and I had to answer it so I hit escape and the game was paused. I was afk for a while and when I came back my connection was lost (but the game still paused and I seemed to be alive). I had to accept that and the session was closed... and my Hero dead.
There was no message in my chatlog which said I died or was slain or anything, I'm just dead.
The hero was only level 14 so it's no problem for me ... but I thought you should know.
P.S. I was not in town ... of course.