Plot hole: Will, Jake, and Vera are continuing their lives with the assumption that Joan Ferguson is dead. When the police found a body they suspected it was Ferguson pending a DNA test, as this was relayed to Vera. It wasn't Ferguson, as she's alive. The police never told the three corrections staff whether it was her. Channing got framed for the death because he got framed for the escape and burial when Jake and Will planted the shovels in his car. His lawyers should have got disclosure.
Suggested correction: This is correct but Channing was already in jail for shooting Officer Murphy, he would have been stuck in there anyway but just on one charge.