know better sleep with sleep number. >>> at first, investigators assumed the fire in edith ann haynesome was accidental. most likely caused by an electrical problem. but when the medical examiner ruled ms. haynes' death a homicide, investigators called in mike lane, an expert in the field of fire investigations. >> all i wanted him to be able to do was tell me, was this an arson, was it not an arson? and if it was, how did it start, where did it start? you know, tell me as much about the fire as you can. >> the first thing he did was to conduct a room-by-room search trying to determine where the fire started and how it spread. >> if you have a large area, you can determine heat flow and directionality by cutting this wall stud in two. and when you cut it in two, looking down on the top, you can see that the fire came from this direction and flowed around this point. we have much more degradation right here than we do on this side. >> lane then drew a diagram of the floor plan and charted the burn patterns using an arrow to point toward the heat source. >> examining this pattern, it in

manipulate ann haynes. he thought he could manipulate investigators, and he believed he was getting away with it. victim to temptation. >> he made a mistake thattium arer sure a lot of people could identify with. >> then he vanishes without a trace. for almost 20 years, the disappearance goes unsolved. until a tiny chip of paint tells of a terrifying ordeal. >> it would drive me crazy to know what a murder victim goes through every time they're killed. ♪ >>> the copper mine outside salt lake city, utah, is known as the richest toll on earth and copper isn't the only valuable mineral. >> they have gold and silver. they have very expensiive equipment. you don't just go there without usually encountering security. >> so, when the security guard wasn't on duty in 1991, it was unusual. >> i went up and figured he might be in the rest room and went and found his lunch was partly eaten, his hardhat was still there. >> the guard, rhine ruyan ruth,t suppose to leave for any reason. >> it was a strange moment where h