3331 Bill the Mountain Dwarf Berserker (level 9, 0/75 (77) HPs)
Killed from afar by an electrical eel on Level 9 of the Dungeon.
I found a potion of mutation early on in this game that gave my character the berserk mutation, which meant that I randomly went berserk while fighting. This made the game extremely frustrating, as I was constantly running out of food and getting into trouble because I was berserking at very bad times. However, I fought through and made it all the way to level 9 of the Dungeon.
Level 9 was a big open area with a multitude of small lakes and each lake had one or two electrical eels. Without proper resistance, such a level is very dangerous, as you can quickly find yourself in range of 3 or 4 eels and take 3-4 lightning bolt hits with every step you take. That is what happened to me. I really should have just skipped the level, as there was no need to clear it out.
Lessons Learned
1. Avoid electrical eels when you do not have the proper resistances.