Police in Co Fermanagh have appealed for help after they identified a body discovered in a bog in February as that of a former bus-driver, Mr David Sullivan.
The RUC says it has been unable to determine the cause of death.
Mr Sullivan suffered from an advanced case of Parkinson's disease. Forensic tests have established that his body may had been in the bog near Belcoo for 18 months.
Mr Sullivan (51) disappeared from his Enniskillen home in August 1998 and a month later his car was found with false number plates in Co Cavan. Det Chief Insp Norman Baxter said tests had not revealed how Mr Sullivan died or whether he was murdered. "The death remains suspicious," he said.