Here is a source list of links to media reporting the newest ISIS video… whether it is staged or not, is another debate.
http://www.theguardian.com/world/2014/sep/13/isis-video-david-haines-beheading
http://www.mirror.co.uk/news/uk-news/david-haines-beheading-isis-release-4256777
http://www.thedailybeast.com/cheats/2014/09/13/isis-beheads-british-hostage.html