and as for the susan berman case, attorney dick deguerin insists bob had nothing to do with her murder date has been set yet, but when deguerin does go to court he faces a tough deputy d.a. named john lewin. >> never lost a case, i think. >> you know, in texas we have a saying. "ain't been a horse can't be rode, ain't been a cowboy can't be throwed." >> reporter: but will the upcoming trials solve the mysteries of robert durst? well, maybe not. which is why we're about to return to california. and that place they call the lost coast. >>> coming up, a missing teenager. >> karen, where are you? >> investigators wonder is there a link? >> robert durst is a person of interest in this case. e used to get excited about things like concert tickets or a new snowboard. matt: whoo! whoo! jen: but that all changed when we bought a house. matt: voilà! jen: matt started turning into his dad. matt: mm. that's some good mulch. ♪ i'm awake. but it was pretty nifty when jen showed me how easy it was to protect our home and auto with progressive. [ wrapper crinkling ] get this butterscotch out of here.