Well, Netanyahu has denied it at least once, and Tucker still seems to be insisting on it at his own peril.

Normally, when someone is shot in an enclosed space, forensics produces a slug recovered at the scene and an autopsy confirms that slug did the damage. I haven't seen either at this point (granted, I could have missed the report). I find it suspicious that a hunting rifle from that range didn't send the bullet right through the soft tissue in his neck and lodge it in something behind Charlie.

Some people are making the case what we saw was actually an exit wound, but that makes me wonder where the bullet is. Another interesting theory is that his mic transmitter was loaded with a small explosive.