Stephen McCullough’s body was discovered at the foot of Cavehill in 2002 —shortly after he was released from police custody.
The circumstances of his death were raised during a preliminary hearing touching the killing of Catholic postman Daniel McColgan in January of the same year.
Barrister Andrew Moriarty, for the McColgan family, claimed materialwhich had been disclosed for a forthcoming inquest, suggested Mr McCullough, 39, may have had information about the unsolved loyalist shooting.
He said: “There is a suggestion he might have been killed.”
However, senior coroner John Leckey said there was no evidence of foul play inMr McCullough’s death.
He said that an investigation by the Northern Ireland Police Ombudsman had also failed to find anything untoward and the family had not asked for an inquest.
An inquest for Daniel McColgan is scheduled to start next Monday.