In August 2000, Dennis and Mary Hill lost their 13-year-old daughter, Amy, in a tragic car accident. "I just see how hollow my life is now," says Dennis. "And I never thought I would experience that in my lifetime." "I believe the reason I was put on this Earth was to have Amy," says Mary. Before the accident, the Hills appeared to be living the extremely good life outside Orlando, Fla. They owned a successful marketing business, lived in a stately home, and their daughters, Amy and Kaitlin, were excelling in and out of school. On Aug. 7, 2000, Mary and Dennis went to pick their daughter Amy up from her first day of eighth grade. With her were best friends Carrie Brown and Zak Rockwell. The three were inseparable. On the way home, Dennis told Mary he needed to make a stop. Mary drove off with the three kids in the back seat. Everything would change during the next few minutes. Correspondent Peter Van Sant reports on how this seven-mile trip home from school ended in tragedy.