Gardaí have released two men they had been questioning over the murder of Keith Walker.
The 36-year-old father-of-two was shot to death in Clonsilla in West Dublin last weekend in a case of mistaken identity.
Earlier today a third man was charged in court in relation to the killing.
Thirty-two-year-old Christopher McDonald, of no fixed abode, has been remanded in custody and will appear before Cloverhill District Court next Friday.