WILMINGTON -- Four years after Allison Jackson Foy disappeared in Wilmington, police and family members continue their search for answers in what is now a double-homicide investigation.

July 30, 2006 marked the day Jackson Foy disappeared. She was last seen at a Wilmington bar on Carolina Beach Road.

Two years later in April 2008, Wilmington police found her body just a few miles down the street in a wooded area off Carolina Beach Road. She was discovered next to another woman's remains, Angela Rothen.

Jackson Foy's sister Lisa Valentino said the family still has no idea who's responsible for their deaths.

"She was literally ripped out of our lives and it just seems so, so, so unfair because there's so much that all of us don't get to have together," said Valentino.

Det. Lee Odham continues searching for answers and the public's help.

"The smallest piece of information, the smallest thing that they don't think is important, may be the whole case for us," explained Odham.

He also said it's challenging to find answers because there was no DNA evidence discovered on either body or at the scene.

Now police have sent dozens of pieces of new evidence to the SBI crime lab from several different cases that could be linked to this mystery, including evidence seized from the home of Leslie White. Police call him a person of interest in the case.

"He knew one of the victims, he had familiarity with one of the actual dump sites, if you will, and he made several off statements," said Odham.

Odham said former cab driver Tim Iannone also remains a person of interest. Iannone was named in a search warrant but never charged.

"We have not been able to rule Mr. Iannone out as a suspect," said Odham.

The new Major Case Analysis Team within the police department is also looking at the case.

"I think it's important for the old cases to be worked as hard as the new ones," said Odham.

Police and family members hope continued efforts will help answer lingering questions.

"We really want justice and we want to see whoever is responsible for doing this serves time and is taken off the streets," said Valentino.

Jackson Foy's family is helping raise money for other families of missing persons through the Allison Jackson Foy Memorial Fund. All proceeds benefit the Cue Center for Missing Persons. Click here for donation information.