a friend some time ago had an addon callled revenge list i think...
when u gott killed... the name of the person that killed u was stored in a "book" this book was updated so u could go back andd see how manytimes that person had killed u and how many time u have killed him..
kinda nifty when u walke around see a name that u finde weery known.. then u pop up the book and u can see ahh this dude killed me 5 times when i was lvl 42 time for revenge!

but i can t finde it.. anyone that can help?

Lo, There was a mod a long time ago called "azaziels book of the dead" ( http://wow-en.curse-gaming.com/downloads/addons/combat/azaziels-book-of-the-dead/ )

But unfortunately it's no longer in development, I used it myself but haven't found a replacement yet!

Someone know of a working mod like that?

Dam i rly want that one..

ill try and do some more seatching and ill pop a linkt here if i finde one...

Try searching for mobs with the names of "kill on site" or KOS