Hosam Saraya, who had returned to Syria to aid his ill father, was executed along with other members of his family. Their killings were captured on video recorded by the gunmen.

With loved ones trapped in Syria and videos of brutal attacks spreading on social media, they're begging for someone - anyone - to help.

The U.S. State Department confirmed on Tuesday that a U.S. citizen was killed in Syria after disturbing videos surfaced showing him among a group of men apparently being executed by Syrian government forces.