Forensic Files - Season 8 Episode 37 -

A high school gym teacher took time off from class to give his friend a ride home -- and never returned. After his disappearance, his wife and friend received letters, explaining that he needed to make a clean break and start a new life. Investigators suspected foul play but, without a body, the case would be difficult to prove… difficult, but with the help of forensic science, not impossible.