What are the potential rift bosses?

Last night, while doing some Nephalem rifts, I encountered both "The Butcher" and "Zoltun Kuule" as rift bosses, only they were renamed slightly (The butcher had a different name, and a subtitle of "Meat Chopper"). Both retained several of their boss abilities from their original Acts, but this was the first time I'd encountered former bosses in a rift. Others seemed to be randomly generated champions. Does anyone know, or have enough experience to say, where the rift bosses are picked from?


Here is a non complete list of rift bosses :

  • Agnidox (N/A)
  • Bone Warlock (N/A)
  • The Binder (N/A)
  • Blighter (Herald of Pestilence)
  • Bloodmaw (N/A)
  • The Choker (N/A)
  • Cold Snap (Izual)
  • Crusader King (Skeleton King)
  • Ember (Nekarat the Keywarden)
  • Erethon (Death Maiden)
  • Eskandiel (Malthael)
  • Flesh Carver (The Butcher)
  • Gluttony (Ghom)
  • Infernal Maiden (N/A)
  • Lord of Bells (Cow King [Easter Egg])
  • Mistress of Pain (Cydaea)
  • Perdition (Rakanoth)
  • Perendi (Mallet Lord)
  • Raiziel (N/A)
  • Reformed Warden (Warden)
  • Rime (Xahrith the Keywarden)
  • Rokrak (Fallen Champion)
  • Stone Singer (Sand Golem)
  • Sand Shaper (Zoltun Kulle)
  • Satrix (Writhing Deceiver)
  • Spider Queen (Queen Araneae)
  • Tethrys (Succubus)
  • Voracity (N/A)

I'll complete and cross check it later with data from achievements.