On February 19, 2005, Richard Petrone and Danielle Imbo walked out of a bar on South Street. They have not been seen since.
The FBI is now offering a reward for information leading to the arrest and conviction of anyone who may have been involved in their disappearance.
Petrone, who was 35 at the time, and Imbo, who was 34, were dating when they disappeared. Also never found was Petrone's 2001 black Dodge Dakota pickup truck with a Pennsylvania license plate YFH2319.
Imbo, who worked as a loan mortgage processor, was last seen wearing a dark jacket, cream-colored sweater and blue jeans. She was carrying a two handled black purse and was wearing three silver rings on one of her middle fingers. She has a tattoo of flowers on her lower back. She sometimes went by her maiden name, Danielle Ottobre.
Imbo was going through a difficult divorce from her husband Joe Imbo at the time, but authorities were able to place Joe Imbo at a family function in Toms River, N.J. at the time of the disappearance.
There have been other rumors, speculations and suspects related to this incident over the years, but none have ever been confirmed or proven.
Petrone, who worked at a family bakery in Ardmore, was last seen wearing a gray Polo sweatshirt and blue jeans. He has a tattoo of the name Angela on his left arm and a tattoo of clowns on his right arm.
FBI Agent Vito Roselli, who has been working on the case since the beginning. He told 6ABC that he hasn't ruled out any potential suspect over the two decade investigation, and that more than one person knows what happened that night. "People know," he said.
Anyone with information can contact the local FBI office or the nearest American Embassy or Consulate.