Hot link:
http://www.youtube.com/watch?feature=player_embedded&v=sxGWlOQZyEs&oref=http%3A%2F%2Fwww.gatestoneinstitute.org%2F3092%2Ftunisia-muslims-slaughter-apostate&skipcontrinter=1
Thank you for the hot link
Originally the video is from Syria - it is the Free Syrian Army, killing a Shia.