The 33 year old from Clondalkin has been named as the man whose body was found in a County Kildare canal last Saturday.
Gardaí want to talk to anyone who was in touch with Mr O'Brien in person, or by phone or text between Friday and Saturday morning.
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They've renewed an appeal to people who were near the Grand Canal at Ardclough during that period.
Superintendent Gerard Wall, who's leading the murder inquiry, says Mr O'Brien was a family man.
