but then, detective brian slinger started digging into his past. >> we were able to find that he was y began researching the case but the information was limited, after all it was 18 years earlier. >> did you learn anything else about that case? >> we learned that it was a shooting between him and another group of people at the time, and for whatever reason went to a jury trial and he was acquitted of it. >> acquitted of all charges, but still. >> you are seeing george broach, homicide? >> correct. >> that must have set off alarm bells right? there >> it did. >> the detectives also learned that george birch had been suspected of crime here in green bay, the crime far less serious, a traffic accident that occurred about two weeks after nikki's murder. someone drove the chevy blazer into a parked car, then abandoned it on a green bay street. the blazer happened to belong to -- once you think somebody else at the car? >> yes. he swore he didn't do. it he claimed it was stolen. a seemingly minor offense, and green bay police never ended up charging him with a crime. but during their inves