I note a few things from the paltry info in the articles I've seen...
Hours earlier the home owner made a police report of an attempted robbery and damage to his property.
It was night time and the person who owns the house at the end of a log private drive was in the house with the lights off. (I often have my lights off at night, duh.)
He had a .22 rifle in the house with him. (I have numerous firearms in my place, with me.)
He hears a vehicle coming down the drive and observes it's headlights, and as it approaches the garage he moves from the house to the garage.
The intruders aim flashlights into the eyes of the homeowner when he opens the garage door, essentially blinding him. (Remember, he is alone, far from help, on his private property, and sees lights, obviously held by two or more people, blinding him.)
In fear for his life he fires his .22 rifle in the direction of the intruders, striking and killing one.
The wife of the person he killed claims they thought the homeowner was an intruder. (They, themselves were on private property they did not own.)
The wife claims they had permission to be there to remove some parts from a truck on the property. (But the only tools they had with them were burglary tools, and they were wearing gloves.)
She later made an "Alford" plea saying she'd probably be found guilty of burglary.
She did not follow the court's orders and was re-arrested.
Both the dead man and the wife have a drug and burglary history, and the wife has since been arrested yet again on drug charges.
Firing after the retreating wife is a toss-up. She could have been running to retrieve a weapon, to get the assistance of another accomplice, or even just to reach cover before returning fire. To a homeowner just blinded by two or more folks carrying flashlights and confronting the homeowner on his property, I can easily understand his still being in fear for his life - especially that far from any help.
I hope the homeowner has a damned good lawyer. I do not believe he committed a crime.
Best of luck to the homeowner.