are investigating a possible bob durst connection, too. e only person of interest. there are five others. >> the evidence, the circumstantial evidence, is just not there at this point. >> reporter: that old composite sketch, for example, could this be robert durst? >> were you impressed by the similarities? >> i'm impressed by the similarities, but my questions are being able to recognize somebody in a very small space and window, and then being able to recount that in a description that's -- that's pretty precise. >> reporter: that sketch? ridiculous, said durst's attorney, dick deguerin. >> i know bob pretty well. that doesn't look anything like him. it looks like mr. potato head. >> reporter: so who was that witness of 18 years ago? would he still remember? the cops hadn't spoken to him recently, so we found him riding his tractor in the green hills above eureka. his name is randy gomes, an army vet and a local carpenter. did he remember? >> i looked right in because i was yelling at him. >> reporter: yelling at him, because that guy cut