David Haines is the third Western captive to be executed on video by ISIS. His family is dealing with an unimaginable tragedy. His brother Mike is speaking out about David's motivation to be an aid worker. Nic Robertson has the latest.
ISIS' videos show horrifying acts of brutality carried out in Syria and Iraq. Those graphic images have many people wondering whether ISIS could launch an attack on U.S. soil. Anderson looked at ISIS' capabilities with CNN Political commentator Peter Beinart and retired Army Lieutenant General Mark Hertling.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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