I'm not sure if this has aired or what, but I downloaded it recently (it comes out on DVD in July). I haven't watched much, but it begins with Michael and Sarah's wedding. Unfortunately, said wedding is interrupted when government officials come by to arrest Sarah for the murder of Michael's mother, Christine... Christina? I forget, but that chick.
They have a video of Sarah pulling the trigger, and she obviously killed her... but they don't have the fact that the woman was holding a gun to Michael at the time. So yeah, Sarah goes away.
What happens next, I have no idea.