A man remains in garda custody this morning in connection with the murder of Noel Duggan in Co Meath last month.
The 57-year-old was shot dead in his car outside his house in the Old Mill estate in Ratoath on March 23.
A man in his mid 40s, from Dublin, was arrested yesterday afternoon.
He is being questioned at Ashbourne Garda station.
Mr Duggan's murder is believed to be linked to the ongoing feud between the rival Hutch and Kinahan families.