somewhere along the way, smith raped and murdered carolyn killaby in his truck. splattered on his steering wheel, smith's watch and probably the upholstery. prosecutors suspect smith buried carolyn's body somewhere near larch mountain. a few hours later, a gas station attendant said she saw a bloodstain on smith's shirt and that his truck was full of mud. smith attempted to remove the blood inside his truck with detergents. and when he couldn't remove it all from the upholstery, he set it on fire. but he missed a tiny speck of blood on his wristband and a tiny speck of blood on the steering wheel, proof that carolyn killaby had been bleeding inside his truck. >> some of his friends happened to be nurses. he went into great detail with his nurse friends about what is dna. how do you get rid of dna. i used pinesol and lysol and other cleaning agents in my car. is that going to get rid of dna? and the nurses say, hey, i don't think so. >> prosecutors also discovered that when smith was in prison for killing his sister, he told his cell mate how he would get away with

. -- captions by vitac -- www.vitac.com >>> in 1995, carolyn killaby of vancouver, washington, got intoeated argument with her husband. she then went to a local bar alone. no one has seen or heard from her since. but some saliva from an envelope and a speck of blood on a wristwatch helped solve the mystery of her disappearance. >>> in 1990, carolyn and dan killaby were married, each for the second time.