What animal can kill a great white shark?

Sharks are very dangerous animals in the ocean, but they can become prey to other animals.
Killer whale can easily swallow a shark whole and have a nice meal. 

Some sharks will eat other sharks too. The gray shark and great white shark will eat

others sharks smaller than themselves.

But in this case the answer is the large grouper fish.

This video was recorde by Fisherman Off Florida Waters.