Directors Gretchen and John Morning will premiere their documentary on Kathy Gilleran's search for her missing gay son at New York City's Tribeca Film Festival, which takes place from April 20 to May 1.

GONE follows Kathy, a retired Ithaca, New York police officer, as she walks the streets of Vienna searching for answers to what happened to her son Aeryn, who has been missing since October 29th, 2007.

Unsympathetic Vienna police told Kathy that Aeryn, a 34-year-old former Mr. Gay Austria, must have committed suicide because he had tested HIV positive. They informed her that he ran out of a men's sauna, the Kaiserbrundl, and onto the streets of Vienna in an emotional panic and jumped into the Danube to his death.

Kathy didn't buy the officer's version of the events and began asking her own questions.

In a 2008 interview with On Top Magazine, Kathy said she believed the police and the owners of the Kaiserbrundl were hiding something.

GONE premieres on April 23.