he is a just the facts kind of guy. he is not afraid to challenge the president. he once threatened to resign over a controversial surveillance plan during the last bush administration, david. >> pierre, thank you. we move on now tonight to newly released surveillance video showing the fatal beating of an american while abroad. baa car -- bakari henderson just graduating from college in may, celebrating with a vacation in greece with friends. the video shows him running and then a mob chasing him. and a warning, it's disturbing. here's kayna whitworth. >> reporter: tonight, the newly released surveillance video, 22-year-old bakari henderson, seen running from a mob of angry men on the greek island of zakynthos. he's shoved into a car, violently kicked and punched in the face, his friends say he was pummeled with brass knuckles. the savage attack carried out in under 15 seconds, a man and woman rushing to stop the beating, someone performing cpr, but it wasn't enough. later, authorities saying henderson wasn't able to defend himself, suffering severe head trauma.