heh...uh...well, my total of dead companions has gone up to three.
Lydia was killed by an orc with a battleaxe in Swindler's Den. In a way, it's her fault Kematu ended up in such a mess. If she had survived, I may have been more inclined to hear Kematu's side of the story...but despite our large ears, werewolves don't listen too good.
Vilkas...poor Vilkas...with your awesome Lithuanian accent....killed by Red Eagle at the climax of a sidequest. Red Eagle tasted the might of Jaeger and the Volendrung immediately afterwards, but your corpse will forever sit against that pillar. And just to take the piss, every time I open 'The Legend of Red Eagle', I get to do the quest all over again!
And finally, the newest addition. Kharjo. After being launched into orbit by a giant, twice, and surviving, I thought you were made of sterner stuff. During a raid on...uh...Tera..Tertha's Watch, something along those lines, that damn bandit spellcaster knocked the khajiit to the floor, and as I swung Volendrung at her head, she ducked, and I shattered Kharjo's spine instead. Bloody shame.