19 year old Conor O'Brien was shot dead last Thursday.
A man in his 50s is being questioned in connection with the murder of Conor O'Brien in Enfield
The 19-year-old was shot dead outside his flat in the town late on Thursday.
Gardai say he wasn't known to them "in any form" and have described him as someone who "kept to himself".
Conor's funeral service took place earlier today.
A man was detained yesterday for possession of a handgun in Carlow, and is now being questioned at Carlow Garda Station in connection with Conor's death.

The Castledermot Town Centre First Plan Has Been Launched
Over €2,000 Damage Caused in Vandalism at Athy Sports Ground
Information Meeting On Water Quality And Water-Related Issues To Be Held In Johnstownbridge This Month
Weather Warning Issues Storm Dave Approaches Ireland
Investigation Into Death Of Inmate In Portlaoise Prison
Intel Reclaims Control of Key Irish Chip Facility In Leixlip
€7m Worth Of Cannabis Seized In Athy
Kfm Obituary Notices