The 45 year old was detained by officers on Wednesday.
A man, also in his 40's, was arrested on Thursday evening- he was released without charge earlier, with a file being prepared for the DPP.
- Advertisement -
The pair had been held at Tipp Town Garda Station.
Father of two Bobby Ryan vanished as he left for work in the early hours of June 2011- his body was subsequently discovered in a disused slurry pit at Fawnagown between Tipp Town and Bansha last year.
