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20-year-old Mr Byrne's skeletal remains were discovered in Blessington in 2010
A man who was arrested in connection with the murder of Dublin man Paul 'Frank' Byrne has been released without charge.
Gardai say a file will now be prepared for the Director of Public Prosecutions.
20-year-old Mr Byrne's skeletal remains were discovered in Wicklow in 2010, after he was last seen in Tallaght in Dublin during the summer of 2009.
A man in his 30s was arrested in connection with the case in the Dublin area yesterday but has now been released without charge.