Gardaí at Kevin St, Dublin are still questioning a man about the murder of James Curran at a pub in Dublin on April 3rd.
The man in his 40s was arrested at Meath St, Dublin yesterday as part of an ongoing investigation.
Mr Curran was shot in the head in the Green Lizard pub on Francis Street, Dublin.
The champion kick boxer was originally from the south inner city area but had been living in Santry. He trained young people in martial arts in a room above a takeaway outlet around 300 metres from the scene of the shooting on Meath Street.
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Several people have been arrested for questioning about the murder and released without charge.