No one has heard from Theresa Ann Gregory since 1982. (Family photo)

RCMP are asking the public to help solve the case of a woman who disappeared 27 years ago, and who the family believes was murdered.

Theresa Ann Gregory has been missing since 1982. Her family thinks her body lies in an unmarked grave somewhere on P.E.I.

Cheryl Doherty last spoke to her sister on Sunday, June 20, 1982. The next day the 31-year-old Gregory disappeared from her home near Morell, seemingly without a trace. Doherty told CBC News on Monday the last person to see Gregory before she vanished was her husband. He has since died.

"We are appealing to Crime Stoppers in hopes that somebody knows something," said Doherty.

"It's our belief that she's not alive and the goal here is to find her remains, to properly bury her. This is a difficult thing to wake up every day knowing she's possibly buried somewhere in an unmarked grave and we can't leave her there. We have to try to find her."

'We can't leave her there. We have to try to find her.'— Cheryl Doherty

Gregory left behind a 16-year-old daughter, and an 11-year-old son.

RCMP said they have exhausted all avenues in finding her — her bank accounts have never been used, her social insurance number has never shown up again — and so they have turned to the public for help in solving the cold case.

Not about 'who did it'

Doherty said any tip may be one that helps the family give Gregory a proper burial.

"Maybe somebody heard a rumour, maybe someone believes she's buried in a particular place," she said.

"Maybe somebody knows something and they're afraid to talk about it, Maybe they're afraid because they waited too long to get the information out. This isn't about how it happened, who did it, it's about finding her remains and anyone that can come up with information to bring us closer to that would be greatly appreciated by the family."

Police are asking anyone with any information to call Crime Stoppers or the Montague detachment of the RCMP.