chris and denise tagney, katie's grandparents, saw the truck coming from the back of the limo. >> denise tagney: i saw this light come towards me. and i had to think for a second of what that was, because that... it was just out of place. >> simon: this is what she saw. this video was taken by a camera in the limousine. >> denise tagney: i watched this single light come toward me, and all of a sudden, it went from a single light to a double light. it happened so quickly. i remember saying, "oh, my god, we're going to get hit." >> nassau police emergency. >> there's a huge accident on the meadowbrook parkway. it's really, really bad, bad. >> simon: they got hit with incredible force. both cars were totally destroyed, but that was the least of it. stanley rabbinowitz, the limo driver, was killed instantly. the limousine was so mangled that members of the flynn family had to be cut out of the wreckage. virtually everyone suffered severe, life-threatening injuries. and then there was katie. >> neil flynn: the first thing i heard was my wife screaming, "neil, katie's dead." and i kept saying,