One was a baby of a soldier who got into a fight. Got its lung damaged and for about a year or so, it kept passing out every few seconds. The mother would cling to it while fighting off goblins. Fast foward, the mother was slain in an epic battle, baby knocked from her hands (still alive), and the mother then killed something like 6 goblins single handedly (legendary spear dwarf champion) and finally died from the 2 or 3 arrows stuck in her. The baby wandered the map for about a month before someone found it and gave it something to drink/eat. Fast foward again, the baby is now a child, father goes nuts from stress and the baby's lung is now at yellow, but from being dropped in that battle, has a broken arm. Father dies after guard accidentally killed him.
Child is finally adult, and is assigned to the army, still having breathing issues, but the arm's all good now. While sparring, has his eyes cut out and bleeds to death.
As for another one, I was on a map with a friendly goblin tower. Those friendly goblins just wouldn't do, so I decided to undermine the place and collapse it. I had a support under it and a lever to detonate it a good distance away. I didn't notice the hunter running underneath when the lever was pulled, and well... 11 floors of obsidian, goblins, and demon came crashing down on the poor shmuck.
There was also the phoenix in a modded game... A dwarf wandered off, had half its body pecked to mangled by the phoenix before it finally ignited and burned up, leaving behind the dwarf's shoes, a sock, and blackened bone.
Finally, though not the death of a dwarf, a wrestler who went from no skill to 2 ranks in a single combat wrestling a goblin because the dwarf broke every single body part (save for organs, though one of the organs reached brown damage) of the goblin before actually delivering any killing blows. Fingers, toes, and all. Finally delivered a killing blow to the stomach and the goblin vomited.