A man in his 30's who was arrested by gardaí investigating the murder of Kenneth O'Brien in county Kildare has been released without charge.

The man, who was arrested last Saturday, was released without charge this morning.

A file will now be prepared for the Director of Public Prosecutions.

A second man - in his 50's - remains in custody.

The remains of 33-year-old Kenneth O' Brien from Clondalkin were found in a suitcase in the Grand Canal in Kildare last month.