Character was a Hurthling Bard. I had no companions with (left my pet in Terinyo) and was exploring below DT looking for a Stone Giant. While walking in a very long corridor I got to some room when the game suddenly froze without any warning. In the room where some herbs, a snake of some sort and another creature which I have forgotten about but which was fairly common. I was playing in tile mode and hadn't noticed anything special on the level so far.
No error or anything was generated and my character is gone. Very much a pity because it was a very lucky bard with AWESOME skills, decent equipment and a RoDS and PoEdu in the pocket! Also thrown rocks level 9 ftw ;)

I have no idea what could cause it: maybe a boss monsters or statue or some such thing? I did have the si but no other artifacts, also didn't do any tagging in my inventory or anything. All settings were basically just standard.
/edit: I had to kill the game with task manager. No error report or anything was generated.