Bluetracker
Tracks Blizzard employees across various accounts.
FYI: Tying one of the dungeon bosses (killing yourself the same time you kill them) results in fighting a different boss without ending your dungeon run
Not sure if this was common knowledge. I certainly didn't know this and was very relieved when my dungeon run didn't end.
Mike Donais
If you tie you don't win or lose. You are still at the same boss number progression wise but you get to try again vs a different boss of the same difficulty.