Ich bin auch zu dumm um die richtige Antwort in WoW-Wiki zu finden xD
Medivh's death was clearly described in The Last Guardian, where it is clearly established that he was slain by the three listed above—with Khadgar wielding the blade that was run through Medivh's heart (and Lothar then decapitating him). Finally, in the interlude The Last Guardian in the Eternity's End campaign in Warcraft III, Medivh is shown in a flashback being killed by human footmen. Though the captain figure in the scene could be Lothar; Khadgar and Garona are nowhere to be seen.
Das sollte es dann aber sein xD