flynn: it's like yesterday to us. >> neil flynn: it was a great day. it was a beautiful wedding. it was a fun time, all day long, and it couldn't have turned out worse. >> simon: the family had hired a limo to take them home from the wedding so they could dance and party with no worries. but as they were being driven home on a parkway on long island, a pickup truck came barreling straight at them in the wrong direction. 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