. >> on the same day he bought the gun, a george d. wilson rented a room in the ymca just across the street from the sears store. >> we actually went into the room where this george wilson had checked in, and from the window of this room you could see the sears store. and it was just kind of -- for us, it was kind of overwhelming being in there and seeing that and trying to figure out what was going on in this man's mind when he was there. >> george wilson listed his home address in miami, florida. >> the address turned out to be a rock quarry. there was nothing there. >> for approximately four years, they checked every person with that name in the united states. >> all were dead ends. it soon became clear that george wilson was not his real name. >>> for years, police in california searched unsuccessfully for the man who robbed four teenagers, stole their car, then killed two police officers. despite several promising leads, investigators were never able to identify a suspect. >> clues in that case that were taken from the time of the incide