A single count of murder in Michigan carries mandatory life in prison without the possibility of parole. No other political charges need to be brought forth for this.
That's according to the DA. The father said he had his firearms locked up. The shooter is 15, he can figure out a combination or find a key or heck even look up YouTube videos on how to pick a lock, it's not like he was 7. We shall see what evidence the DA provides at court of course, which I'm guessing in the case of the guns not being secured is a whole no evidence other than a police officer said it was true.
It also begs the question though: how many parents lock up their car keys when they have children in the house? I'm guessing the number is close to zero, yet if a kid takes their parents' car keys and goes on a killing spree with a car like the black supremacist did in Wisconsin, would anyone really be demanding the parents be charged with involuntary manslaughter? Probably not because most adults realize that could be them sitting in prison right now. But a gun was used? Well that's just those gun nuts who would be locked up, that's not me!