BROCKTON, Mass. -- More than 15 years after a Bay State teenager disappeared, investigators are more convinced than ever that Jennifer Fay was the victim of foul play.

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Liz Brunner Reports On Investigation Resources: Where Is Jennifer?

NewsCenter 5's Liz Brunner reported that Fay was last seen at her home in Brockton in 1989. But now, thanks to five private investigators working for free, Fay's case is back in the forefront.

"People never forget. You will never find someone who will totally forget what happened to Jennifer Fay," said private investigator Joseph White.

The 16-year-old blond-haired, blue-eyed Brockton teen was last seen Nov. 16, 1989. She headed out to a party, never to be seen or heard from again.

"It's been hell waking up every day not knowing, waiting for her to come home. Waiting to hear something," said Fay's mother, Dottie MacLean.

Fay had run away before, but her mother said this time was different.

"She'd always call and she always came home. This time she just didn't," said MacLean.

"A runaway will usually turn up at some point in time somewhere. It's been 15 years, there's been no sign, no contact, nothing," said private investigator Phil White. "Sad to say, but we are fairly certain there is foul play involved."

Putting in about 1,000 hours since February, the investigators have been working pro-bono on unsolved missing children's cases. In this case, they've identified more than 200 people they want to talk to.

"What they need is someone like us to sit down with them and say, 'It's been 15 years. It's time for you to tell us those things that maybe you couldn't tell us, or were afraid to tell us, or just didn't want to tell us 15 years ago,'" said Joseph White.

"This particular case has all the earmarkings of a real good screenplay -- sex, drugs and rock and roll," said Phil White. "She was running with a pretty fast crowd, and a fast crowd does not want to say too much about what they were doing."

The investigators are determined to find out what happened to the teenager.

"It may take a month, but our profession dictates we find an answer to that question," said Joseph White.

The investigators said they are learning new information about the case every day.

"If anyone does know anything, to please contact us, and let us find her, it's been too long," said MacLean.

All five investigators volunteer to work on missing children cases for the Molly Bish Foundation.