The Central Criminal Court was told a row with racial undertones ultimately led to a 15-year-old black youth being stabbed to death.
Michael Barry, 26, from Pigeon House Road, Ringsend, Dublin 4, has pleaded not guilty to the murder of Nigerian-born teenager Toyosi Shittabey in Tyrrelstown, Dublin 15, on 2 April 2010.
He is also charged with producing a baseball bat on the day in question.
The prosecution made it clear to the jury of seven men and five women that it is not their case he carried out the actual act that killed Mr Shittabey.
They will allege he rendered it possible for his brother, Paul Barry, to carry out the act of stabbing the victim.
Paul Barry is now deceased.
Prosecuting Counsel Brendan Grehan said they would hear during the trial the basis on which the prosecution will seek a conviction for murder on Michael Barry.
In his opening statements, Mr Grehan said on the day in question the victim was with a "group of five black youths and four white females".
One of the girls asked for the light of a cigarette from Paul Barry.
A row then ensued with racist name calling directed towards the group. One of the people in Mr Shittabey's company took exception to this and a fight broke out.
Later, Mr Barry and his brother Paul, believing a phone was taken by the group, pursued them in a Nissan car. They encountered them at a roundabout in Tyrrelstown.
Paul Barry, who was holding a knife, approached one of the youths.
It is claimed Toyosi Shittabey went to his assistance, at which point Paul Barry turned around and the knife "ended up in the chest of the deceased".
Paul Barry went back to the Nissan Qashqai, where Michael Barry had remained. Both men drove off.
The court heard gardaí attending the scene found the victim covered in blood and attempted to revive him. He was taken by ambulance to Connolly Hospital Blanchardstown but later died.
The case continues.