A post mortem examination on the body on a man which was found in a freezer at the rear of a fishmonger's shop in Galway has established that he died as a result of severe head injuries.
However, gardaí say the examination failed to establish when Patrick McCormack died and exactly how long his body was in the cold store.
It was hoped that today's post mortem carried out Assistant State Pathologist, Dr Michael Curtis, would yield vital clues as to when Patrick McCormack was murdered. Further tests will now be carried out to establish this.
There had been speculation that the body could have been in the freezer for up to five years.
Gardaí are treating the death as murder.
A team of 50 gardaí and detectives are now involved in an investigation in Dublin, Galway and Clare - where a car he owned was found shortly after he disappeared.
They are also trying to establish a motive for his death and track down his killer or killers.
The last reported sighting of the 52-year-old, from Upper Artane Cottages on the Malahide Road in Artane, Dublin, was five years ago.