The true-crime story of North Port couple Gabrielle “Gabby” Petito and her fiancé Brian Laundrie has drawn spectators, amateur sleuths, and obsessed followers online. From Dog the Bounty Hunter to congressional candidates and area law firms, the frenzy has drawn a number of attention seekers trying to attach their names to the case. While most say they are just trying to help and not out for publicity, experts said the phenomenon is common in cases that capture this kind of global attention. Even John Walsh, known for creating and hosting the show “America’s Most Wanted,” has joined in. Now the host of a show on Discovery network, Walsh aired a “special alert for the Gabby Petito case” and has appeared on CNN and the Dr. Oz show speaking about the case.