Not true bro, I remember that on my first character (good ol' Equinox the mage...) the guard on Windhelm who was supposed to stand asside a priest and a corpse on certain quest was killed by a dragon... I will try though, thanks.
I couldn't stand his screaming so I ran my ebony blade into his face. Well worth it. Oddly his body disappeared shortly after. I kinda wanted to keep it around as a warning to the other crazy homeless who might aspire to bother me.