>The guy who killed Kirk was from LDS family

It is not clear and has not been proven yet that guy actually did it.

It seems he confessed in some way, and a rifle with cartridges was recovered supposed to be the weapon of the crime, but that's no proof by itself.

It is e.g. not clear whether that guy is able to handle that type of rifle in a way to be able make a sure kill from the first shot.