security. >> reporter: keith wasn't the only one who was nervous. >> i got to the point where i became convinced that this guy cortez killed these people in order to steal their property. that's when i said i'm going to the authorities. >> he encouraged keith to do the same. >> he said you need to get to the prosecutor and really turn up the heat. >> keith went to panama city and laid out the case against wild bill to the dij -- the panamanian fbi. >> from that point on, kudos to the panamanian police, they just stepped it up. but for all the suspicion, there was still no hard evidence of a crime. that's when don winner got an idea. he'd heard a lot of stories about wild bill and his ak-47 -- how he'd even fire it off sometimes to impress his friends. but in panama, it's illegal for a civilian to own that type of weapon. so don made a suggestion to police. >> execute a search warrant on his house, find the ak-47, get him in custody.