Forum:KB:Ziro's death - what's the deal?

Please help...If Ziro died shortly after the events of Hostage Crisis (as implied by Hunt for Ziro), then how is it possible that he was alive and back in prison for the Assassin episode? The only logical possibility is that Assassin is a prequel to Hostage Crisis, but this is clearly not the case. Can someone help? Am I missing something?