It's after DNA analysis last night confirmed that body parts found in the canal at Sallins in Co Kildare belonged to the 33 year old Dubliner.
Gardaí are appealing to anyone who may have seen anything suspicious along the Grand Canal in the area to contact them.
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The latest find follows the initial discovery, over a week ago, of Mr O'Brien's partial remains in the canal at Ardclough.
Gardaí are continuing to search for the scene of the 33 year old's murder.
They're urging the owners of premises in Kildare and Dublin to check if equipment or rooms have been disturbed.
