On this week's episode of Supernatural…
Sam and Dean take up a case involving ghostly murders of guilty people.
They learn that the Egyptian God, Osiris, is judging people and sentencing them to death with the help from ghosts.
Osiris captures Dean and puts him on trial. Sam defends him.
The first witness to prove Dean's heavy guilt is Jo, now a ghost because she was killed back in season five.
The second witness is Sam.
The third is never revealed, although Dean fears it will be Amy, who he killed last episode.
Dean is judged and ordered to Death and carried out by Jo.
Sam comes to the rescue and stabs Osiris with a ram's horn, stopping Jo from killing Dean.
Sam recognizes Dean's enormous amount of guilt, but reveals that he doesn't feel guilty anymore. The past is the past and you can only move forward.