On Monday, Noonan was formally arrested by gardai after they called to his home in Kilmartin Gardens in Tallaght. Detectives questioned the ex-IRA hardman about suspicions that he had an involvement in hiring killer Daniel Gaynor to shoot Robert.
Hitman-for-hire Gaynor (25), who is a suspect in four murders, was himself found gunned down near his home in Finglas last month.
