A new video surfacing on Tuesday purported to show the beheading of another American journalist, Steven Sotloff, by the Islamic State of Iraq and Syria. Sotloff, who freelanced for Time and Foreign Policy was last seen in August 2013, and has featured in the earlier video of the execution of James Foley. “We have seen a video that purports to be the murder of US citizen Steven Sotloff by the Islamic State of Iraq and the Levant (ISIL).  The intelligence community is working as quickly as...