Did a suicide bomber upset with Zarqawi set off his bomb a little early?
I doubt Zarqawi spends any time around primed explosives. Those suicide belts/vests are so unreliable I'd be surprised if any upper tier Al Qaeda commanders go within range of these things.
Then again, maybe he was wearing it and he decided it was time to martyr himself.
Maybe SAS snipers took out a Suicide bomber having the last handshake with Zarqawi with a gut shot.
"Then again, maybe he was wearing it and he decided it was time to martyr himself."
I hope it's true, but doubt it.