TBH, I doubt there will be any kind of reckoning inside the justice system or a court of law. As others have pointed out, no body, no case. And, setting personal preferences aside, depending on if/how/when Murphy comes back, it might be hard to convince people that she is/was actually dead versus presumed dead in legal terms.
That being said, I think there will be some kind of reckoning, whether it's with a baseball bat like Snakeboy or something of the more supernatural variety. I'm personally not in favor of a redemption arc for him, but I won't lose any sleep if he gets one.