A mystery and crime festival coming to the Hamptons is garnering backlash from some of the family members of the Gilgo Beach murder victims.

Organizers said the 'Hamptons Whodunnit' festival is created for fans of mysteries, thrillers and true crime stories. The four-day event will kick off in East Hampton Village April 13 and looks to explore notorious crimes and unsolved murder cases, like the Gilgo Beach murders.

Family members of victims Jessica Taylor and Shannan Gilbert said they were disgusted with news of the festival—which boasts graveyard tours, escape rooms and murder mystery trivia alongside hourlong panels on true-crime cases.

It was the disappearance of Gilbert in 2010 that led to a search that uncovered 10 sets of human remains along Ocean Parkway. Police believe it could be the work of a potential serial killer or killers.

Jasmine Robinson, Taylor's cousin, believes the festival is making a mockery of her tragedy and exploiting these murders.

"If it was something that was solely focused on cases, it would be different. But it's not," Robinson said. "It's a mixture of fun, 'Come hang out with Professor Plum and solve this mystery,' all while people are still living in this nightmare."

John Ray, an attorney representing the families of Taylor and Gilbert called the festival "morally sick." He sent a letter to Village Mayor Jerry Larsen urging him to boycott the event.

"This entertainment of the Long Island serial killer case is a disgrace," Ray said. "These people are not just dead, they're murdered. But more so, they've been beheaded. They've been tortured. Their bodies have been atrociously treated."

East Hampton Village officials argue it is not their intention to glorify the Gilgo Beach murders. Trustee Carrie Doyle said the idea of the festival came as a way to bring off-season events to the East End. She began working on the event in September.

Doyle said the goal of their festival is to have educational projects for children and eye-opening discussions for the public.

"Forensic World, which is doing a crime scene simulation, is really a teaching project of how to analyze a crime scene. That's for ages 12 and up," said Doyle. "Our goal with our true crime is to study these stories and try and help bring justice for the victims. At the end of the day, we're really doing it so we can illuminate this case."

Documentary filmmaker Josh Zeman and retired NYPD detective Joseph Giacalone will be hosting the panel on the Gilgo Beach murders to discuss the unsolved case. Robinson said no one from the festival contacted her family to participate in that panel.

Doyle said they were not trying to exclude family members. When planning the festival, she said they started with Zeman and Giacaolone to host the Long Island Serial Killer panel because organizers knew they had been reporting on it.

Robinson said the festival has only opened old wounds.

"This is real life." Robinson said. "We have not received justice. This is an open case and it's like nobody cares."

Ray said that the festival has inflicted extreme emotional distress for the victims' families and they are willing to file a lawsuit if it proceeds.