If it had been premeditated then he'd be facing 1st degree murder. But he shot down an unarmed man without sufficient provocation. You don't get more cold-blooded than that.
Obviously we disagree on the provocation. I agree the retired cop should not have shot the text dude. Under the circumstances based on what’s public, I still think it was justified.
Self defense is in the mind of the person facing an attack. Once the text dude got up and turned around things escalated fast. The man was reportedly 6’ 4” tall and almost thirty years younger than the retired cop. I can see where the old guy may have felt threatened. Who but the “me” generation jumps up and gets hostile over a cellphone conversation with a daycare center?