Gardai are investigating whether the motive for the murder of Kenneth O'Brien may have been of a personal nature.
The 33 year old's dismembered body was found in a suitcase in the Grand Canal in Co Kildare at the weekend.
Phone records and CCTV are being examined for clues.
Journalist with the Herald and Irish Independent Conor Feehan says the murder inquiry team is also trying to find the location where Mr O Brien was killed.
