They already know who he is, his name is Abdel-Majed Abdel Bary, a rapper from England who goes by the name LJinny.
http://nypost.com/2014/08/23/british-rapper-a-suspect-in-journalists-beheading-by-isis/
Here’s his twitter account
http://favstar.fm/users/ItsLJinny/recent
and his rap videos.......
https://www.youtube.com/results?search_query=L+Jinny
Suddenly, Ali G is not so funny. Not that I ever thought it was funny.