A 19-year-old Dublin man has been found guilty of the murder of two Polish men in Drimnagh in 2008.
David Curran of Lissadel Green in Drimnagh had admitted killing the men but denied a charge of murder.
His co-accused, 21-year-old Sean Keogh of Vincent Street West, Inchicore, was found not guilty of murder. He had admitted assaulting one of the victims.
Pawel Kalite and Marius Szwajkos were stabbed to death outside their home in Drimnagh in February 2008.
David Curran, who was 17 at the time, used a screwdriver to stab both men through the head.
He said he was out of his head on drink and drugs and lost control when he wrongly believed his father had been stabbed in an earlier row with Mr Kalite.
But the prosecution said this defence of provocation was made up. They said he was not out of control, simply in a rage because his cousin was in the row and concocted the story about his father much later.
After almost six hours of deliberation the jury found him guilty of murdering Pavel Kalite by a unanimous verdict and guilty of murdering Marius Szwajkos by an 11 to one majority.
Sean Keogh kicked Pavel Kalite in the head as he fell to the ground. The prosecution claimed he was involved in a joint enterprise and was therefore equally responsible for the killings.
But the jury found him not guilty. He will be sentenced for assault at a later date.
Pavel Kalite's sister broke down in tears as the verdict was delivered.
A victim impact statement will be given tomorrow before David Curran is given a mandatory life sentence.