Billie

Billie was a reaper. Sam Winchester heard her singing "O' Death" in Nuckolls County Medical Center while she was reaping the souls of the dead caused by the release of the Darkness. She told him that despite being disappointed over him and Dean killing her boss, Death, people were still dying and would have to be reaped. She also told Sam that him and Dean would no longer be able to continue dying and coming back, because while the old Death found it funny, what lives dies, and when Sam or Dean die, whatever reaper got the privilege of the reap would get to send them to the Empty, where there would be no coming back. She also told him that he was dying, and was unclean in the biblical sense.

Appearances

 * Season 11
 * Form and Void