A 37-year-old convicted criminal was murdered and chopped up before being dumped in a stream.
Detectives identified the body parts found in a wooded area at The Mayne in Clonee, Co Meath, by fingerprints on the Garda database.
A human arm was discovered yesterday by a person out walking.
Other body parts, including his torso, were found during the day as forensic officers, sniffer dogs and Garda divers searched a stream in the area close to the IBM factory.
The victim, a 37-year-old from Blanchardstown, is said to be heavily involved with criminality and well known to gardai.
He was reported missing by a family member three weeks ago.
A Garda spokesman said his name will not be released until all relatives are informed.
A post mortem is being carried out on the body parts by Deputy State Pathologist, Dr Khalid Jabbar, at Connolly Hospital to determine an exact cause of death.
But investigators said he suffered a gruesome death before his body was chopped up and dumped.
The scene remains sealed off and further searches will be carried out tomorrow.
Gardai have appealed for anyone who saw any suspicious activity in the area in recent weeks to come forward.