Gardaí investigating the fatal stabbing of Sean Nolan (18) in Donnybrook on Saturday have appealed for two men to contact them.
The men, who attended Mr Nolan after he was stabbed, are asked to contact the incident room in Donnybrook Garda Station on 01 666 9200.
Sean Nolan from Griffith Court, Fairview, Dublin 3 was stabbed at Waterloo Road shortly after 4am on Saturday morning.
It is believed Mr Nolan was walking along the road with two other students who were out celebrating the end of school term.
All three were from the northside of the city and it is thought that one of them asked another teenager for directions when a row developed.
The teenager then went into a house nearby and came out with a knife which he used to stab Mr Nolan in the upper body. A 17-year-old man was arrested in a nearby house a short time later.
"An-18-year old man was removed to St Vincent Hospital where he was pronounced dead," a Garda statement said later.