It seems that if you succeed in actually killing Osama Bin Laden, it is more than likely that Interpol will try and ensure that you are arrested. The fact that he organized the destruction of The Twin Towers will be no defence, although you could try and use it in mitigation prior to your sentencing.

Obviously, you will need a very good lawyer to argue your case.

I refer you to the following:

Interpol has issued wanted notices for the suspected Mossad agents accused of killing a Hamas terrorist in a luxury Dubai hotel.

Interpol’s website published pictures of the 11 assassins they wished to trace in connection with the murder of Mahmoud al-Mabhouh. Their offence is listed as “crimes against life and health”.

The wanted notices released by Interpol do not constitute an international arrest warrant. Instead, they give details of the accused, to be disseminated worldwide, and request that they be arrested.

Regarding how the UK media is responding:
http://www.spectator.co.uk/melaniephillips/5784131/another-genocidal-mur...