know you'll never have any more memories that all those happy times are gone forever? so, that's what it's like to lose your child. >> the medical examiner determined that pam had been killed on the night she disappeared. pam's husband, byron, had an alibi, and it was corroborated by others, so he wasn't considered a suspect. but police got a tip from a potential eyewitness. he thought he saw pam slumped forward in a white pickup truck on the night she went missing just a mile from where the body was discovered. >> this is a very desolate piece of interstate, very dark, not many vehicles at all. we get off this exit ramp, it really leads to nowhere where her body was found. >> the witness described the driver as a young, white male. >> police began to look for a white male in a white truck. >> unfortunately, there were 35,000 white pickup trucks registered in the baton rouge