About 45 seconds into the six-minute clip, the North Tower collapses, eliciting audible reactions of disbelief. Approximately ...

One of New York's 9/11 first responder heroes, Thomas 'Tommy' Dunn, took his own life last week after struggling for years ...

After rushing to the scene, Tommy had been walking directly toward the South Tower when it came crashing down over lower Manhattan. Consumed by the thick smoke, Tommy pushed on - going on to ...