So I made a very grave mistake.....I recruited Strong and now all he talks about around camp is how he hopes Super Mutants are going to kill everything. So to put the problem in simple terms, he needs to be terminated just like any other super mutant......but the game doesn't let me, he just gets knocked out a bit and then gets back up at full health. Anything I can do to get him permanently dead?

I think you have to dissmiss him and then kill him

you don't, they are impossible to kill.

Doesn't work.....I tried killing Strong when he was not my active companion.

Can he be killed before you recruit him? Maybe if a stray bullet were to tragically take him out when fighting the other super mutants to escape the tower or something?

Maybe its glitched

Companion characters are ranked as essential.
You'll just have to wait for a mod.

Send him to a farm in the middle of nowhere.

He can tell his stories to the Tato's...