There's Just Enough To Go To Trial.

To look at the exact circumstances.

https://us.cnn.com/2021/04/28/us/ahmaud-arbery-suspects-indicted/index.html

However recognising a convicted thief. Leaving a premises he is known to have no legal right to enter.

It is perfectly reasonable to detain him. Until the matter can be resolved.

His decision to attempt to grab a firearm. Makes it reasonable for lethal force to be used against him.

So if those are, in deed, the facts.

Then no Court, in a functioning system of law, could ever possibly convict.