A £20,000 reward has been offered for information about the murder of a Catholic teenager more than 50 years ago.
The 18-year-old’s partially clothed body was found at the bottom of Hadden’s Quarry in Aughnacloy, Co Tyrone, in March 1973.
The teenager, who was from Portadown, had earlier been seen leaving a dance in the company of a man and concerns were later raised when she failed to meet her brother for a lift home.
Last year a Police Ombudsman report highlighted numerous failings in the police investigation into her death.
Earlier this year PSNI chief constable Jon Boutcher ordered an independent peer review into the murder investigation to be carried out by Bedfordshire police.
The PSNI’s Legacy Investigations Branch (LIB) has been looking at the case and last month police arrested a man aged in his 70s who was later released on police bail.
The Crimestoppers charity has now offered £20,000 for information about the murder.
A spokeswoman for the PSNI said police do now know what happened after the victim left the dance.
“I appreciate this murder took place over 50 years ago but we would like to talk to anyone who was at the dance at Hadden’s Garage on the night of Friday, March 30, 1973,” she said.
“Marian’s family deserves to know what happened to her that night and our investigation continues.”