What killed Mufasa?

What do you think killed Mufasa? The fall, or the wildebeest, or a combination of the two?
Here's my personal theory: Mufasa was probably heavily injured by the time he was climbing the cliff. When we see him fall, we can see the rear end of the stampede a few shots later, so I personally think it was the fall and he broke his back or something.
What do you think?
Here's my personal theory: Mufasa was probably heavily injured by the time he was climbing the cliff. When we see him fall, we can see the rear end of the stampede a few shots later, so I personally think it was the fall and he broke his back or something.
What do you think?