Huge amount of commentary about this and I don't know if I want to wade in. I'll just say don't be around these old guys from Pasadena with guns if they get agitated.
It is likely he will be charged because it was daylight, the police dispatch told him repeatedly to stay inside, he said he was going out to kill, the two Hispanics were leaving and he said he was going out to stop them, a shotgun at less than 50 feet is lethal force. You are allowed to kill to stop your property from being robbed, you need better justification about your neighbor's property. He will likely be charge with some more minor offense and plead out with probation.
Would you want a neighbor like this? We have plenty of cheap housing in Pasadena if you do.