I've never thought anything over 10 years was appropriate to a once-in-a-lifetime type of crime of passion. It's enough time for a decent remediation process to prevent a repeat offense OR prove a certainty that the person cannot be trusted free due to mental issues and put them in a permanent non-punitive form of imprisonment.

In his case, if he didn't have access to firearms, he wouldn't be able to kill anyone. Sounds like he needs specialized assisted living, like the old guy who held himself hostage with a shotgun the next town over from me

Nobody can mistake that the 100 years isn't for the good of society, but to punish him for taking a life.