Dean (Jensen Ackles) and Sam’s (Jared Padalecki) angel friend Castiel (Misha Collins) unexpectedly killed Billie the Reaper (Lisa Berry) in the Season 12 mid-season premiere of “Supernatural.” The eldest Winchester had made a deal with the collector of souls to make him and Sam dead for some time so that they could escape a covert facility where they were being locked up.
