A man has been released without charge following his arrest today in relation to the death of Cathal Sweeney earlier in the month.
Mr Sweeney was a former captain of St Mary's Rugby Club in Templeogue, whose son David previously captained the Dublin senior hurlers.
He suffered serious head injuries and died later in hospital following an incident at a flat in Terenure on February 8.
The man arrested today was the second person to be arrested by investigating Gardai.
A male aged in his 30s is currently charged and before the courts in connection with this investigation.