A teenager questioned on suspicion of murder following the death of 19-year-old Jordan McConomy in Derry was arrested after handing himself into police.
Mr McConomy died at Altnagelvin hospital following what police described as an “altercation” with another man in the early hours of yesterday.
The victim, who is from the Rossnagalliagh area of Derry, was seriously injured during an assault at William Street shortly after 2am.
The area near the city centre was closed off throughout yesterday morning as scene of crime officers carried out a finger-tip search.
It is understood it was crowded with people leaving bars at the time of the incident.
William Street is a popular pick-up location for taxis and home to several fast food outlets, and was particularly busy on Saturday night following the earlier Celtic v Rangers Old Firm game.
Confirming the arrest of an 18-year-old man yesterday, PSNI detective chief inspector Geoff Boyce urged any witnesses to come forward.
“We know that many people were socialising in William Street early this morning and we would like to hear from members of the public who witnessed an altercation in the area between approximately 1.45am and 2.15am."
He added that police were particularly keen to speak to motorists with dash cam footage.
News of the death sparked an outpouring of grief on social media.
One close friend paid tribute to the teenager on Facebook, saying: “Still can’t get my head round what’s happened. You were an absolute gent, a legend, a best friend, love ye Jordy fly high bro.”
Another friend of Mr McConomy’s family posted: “God rest u son u were a credit to ur mummy daddy brother and sister.”
SDLP assembly member Mark H Durkan said everyone was thinking of relatives at “an unimaginably difficult time”.
“There is a real sense of sadness and shock across Derry today as the city wakes to the awful news that a young man has lost his life as a result of an incident in our city centre,” he said.
Sinn Fein MP Elisha McCallion also said Mr McConomy's death had devastated his family.
“My thoughts at this time are with the family and friends of this young man,” she said.
DUP MLA Gary Middleton said Derry had been "plunged into sadness at this very tragic news".
