Since the defense didn't even try that excuse, that should tell you it had no merit.
When he was asked when was the last time he saw his wife & son, he lied, over & over. Until his murdered sons' phone showed him there at the right time.
How can he live with himself.
I won't be surprised if he kills himself.
I feel badly for his other son, he's more or less an orphan.
Do something positive.