then, 40 miles away, some boaters on lake shelbyville noticed something. >> they thought it was some garbage, a garbage bag that had floated up to the shoreline. the first thing i thought of when i saw that was, oh, this is going to be bad. >> inside the bag was a woman's head. nearby, police found other garbage bags with the rest of her body. >> i realized that there was a missing person from the friday night before, a female in a neighboring county. and the thought flashed through my mind that this probably is that missing female from the neighboring county. >> dental records confirmed that the body was karyn slover. she was just 23 years old. >> she liked everybody. everybody liked her. who could do such a bizarre thing? you don't think about that happening to you until it does. >> the bags were sealed with duct tape. inside were chunks of cement and cinders, consistent with the material found on the floor of the car karyn was driving. apparently, the killer used the cement to keep the bags under water, but the body gases most likely raised them to the surface. analysts found six

. >> after graduation, i became a newspaper reporter, first at the shelbyville paper and i moved quickly to the daily news journal in murfreesboro, where i became the police reporter in short order. i did a story that included laura's case. but all along i knew i was more interested in police work. >> several years later, dan left journalism and became a police officer. the first cold case he was assigned was laura salmon's murder. >> i didn't become a law enforcement officer to work on this case. but it was always on my mind. so i was quite happy that i got to assist bill sharp on this case. >> one of the first things dan goodwin and bill sharp did was to send all of the evidence to the forensic lab for testing. >> obviously through the advancement in science, through dna testing, maybe we could find the donor of the biological material and match that with our killer. >> while dna testing was under way, sharp and goodwin pursued a new lead which supposedly came from a local high school student, now almost 16 years after laura's murder. >> in 2000, a student at the oakland high school wa