Jo was the inexperienced hunter working with the Roadhouse crew alongside her mother, Ellen. She wanted to prove herself as a hunter and impress Dean, on whom she had a crush. Jo is killed by a hellhound in season 5, helping to save Dean in the process.
Jo would return as a ghost two seasons later. She appears as a witness to Dean's trial, but Osiris fails to convince her to testify against him. She is compelled against her will to try to kill Dean, but luckily snaps out of it before she can cause any injury.
Jeffrey Dean Morgan, who sacrifices himself in the first episode of season 2 to save Dean, reprises his role as Sam and Dean's father in season 14, but as a past version who has jumped forward in time.
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