Prosecution seem intent on following this through to a death penalty sentence So unlikely they are offering to let him plead guilty to life without parole. So I guess his only chance is to plead not guilty and try for some sort of diminished responsibility. Guessing this might be around being under influence/addiction problems, problems with impulse control (ADHD), developmental concerns and upbringing.
I agree with all of you calling this out as an escalation of family violence due to a sense of losing control. I think he has probably made threats to his wife to do this, and then snapped at something that happened that day.
I did think he looked shocked and remorseful the first time I saw him at that very first court appearance. I do think it’s possible he feels this - as well as putting blame for his actions solely on his wife for provoking him.
Rest in Peace little boys.