IDK, to me for the murder charge this is not clear cut. What irritates me is posters at SA saying how come no more fair fights anymore. This 72 y.o. guy against this 31 y.o. guy who looks good sized. Not bringing into account that the old guy was probably a prick and menace. How about saying this 69 y.o. 95 lb. lady fighting this 230 lb. 28 y.o. If she used a pistol and shot the guy, why didn't she just duke it out with the assailant? Come on. In this modern world there is no such thing as a fair fight and everyone seeks an advantage over their attacked or opponent. If a guy with a knife attacks LE do we say that the offcer should've holstered his pistol and fought the guy with a knife too.
If I was at home and someone rushed me with no visible weapon in sight, given the chance and time I would use my pisto/shotgun to stop the threat. If not I would use whatever 2X4, knife, broom, rake or whatever. Other than saying we need more preventative gun confiscation from people possible of committing a crime, I say this incident should at the least bring up legalizing Tasers/batons even those pepper spray pistols that were discussed earlier as being a firearm. My opinions.
That being said, the fact that this old guy had a criminal history and possessing a concealed (in the vehicle) is another story and looks clear cut to me. Condolences to the children and family of the deceased.