That’s what I was wondering. Why not manslaughter?
Reading the whole article states the Mr. Porter left the apartment armed to confront the ex-boyfriend. My question is why leave? Just stay inside, call the police and let the police take care of the situation.
Neighbors shot and killed a man violating a restraining order
Unless I woke up in the wrong country the last I heard neighbors are not in the business of enforcing restraining orders. They will need to prove they had a reason to intervene, such as he was beating on the woman at the time.
Why not defense of a third party. In Texas, you can use deadly force to defend a third person if they would have been justified in using it to defend themselves. Although in this case he seems to have been defending himself and his wife as well.