Osborne's Daughter

Osborne's daughter was the daughter of Osborne and a medical examiner and was in charge of helping her father cover up the truth about the Leviathan Sam and Dean who had pretended to be the brothers to kill people. Osborne's daughter lied to the FBI to protect herself and her father and their work and the FBI insulted the profession. But when she and her father were alone Osborne's daughter was looking over black goo, which was on the Leviathan bodies, and she asked why she and her father lied to the FBI and what this black goo was because it wasn't blood. Suddenly an FBI officer appeared behind her and said she was right about the black goo. He then said he'd known she was lying all along, turned into a Leviathan, and ate her.