Sacrificial champion idea

I have more thoughts about a champion concept, in both lore and gameplay areas, but there is one specific component I wish to see the communities response too.

The champion would have abilities that would cause him to take damage instead of an ally, in order to save their life; an action which of course comes with the risk of the champion dying them-self. Disregard for the moment what those abilities would be, how they'd work or if the following premise would be from the champs passive or one of the abilities. (Actually you could say if you think it should be the passive, an ability-passive-component, or part of the ult.)

What I want input on: If the champions actions to save their ally caused them to die, they would get kill-credit for their own death, and the enemy that killed them would only get an assist. As it currently stands in my mind this would come with all the mechanics of killing another champion. They would collect their own bounty, both their death and kill count would go up (the enemies assist count goes up), etc.

Again, I'm only asking for thoughts/opinions about the one specific concept. You can formulate your own ideas of what else the champion would actually do, if you need to.