It is believed that the man whose body parts were found at a recycling plant in Dublin last month was a foreign national.
Gardaí have yet to identify the remains, which were discovered in a plant in Ballyfermot.
According to the Herald, the neurological screws found in the man's skull were not from an Irish hospital.
Detectives have concluded that the victim was in all probability a foreign national.
While the cause of death is not known, it is believed he may have died 4 or 5 days before his remains were found at Thornton's recycling plant.
Gardaí have determined that the male was aged between 25 and 45 years, and between 5-foot-8 and 6-foot in height.
The neurological screws indicate that the man had undergone neurosurgery in the past.