Gardaí in Dublin are appealing for a taxi driver to come forward who gave a lift to three young men after the Swedish House Mafia gig in the Phoenix Park last summer.
One of the passengers - a 21 year old man - died a short time later.
The deceased and his two friends hailed a taxi on the Navan road near the Ashtown gate between 11.30pm and 1.30am on the night of July 7th.
The taxi brought them to the Rosse Court area of Lucan - whereupon the deceased complained of being ill.
An ambulance was called and he was taken to James Connolly Hospital where he died a short time later.
Gardaí are appealing for the driver of the taxi, who picked up the 3 men, to contact Blanchardstown Garda station to help with the investigation.