Shane Patton was rushed to the intensive care unit of Letterkenny General Hospital where he had serious head injuries, but Gardai confirmed a short time ago that he had passed away.
Two other people involved in the crash, a 38-year-old man and a 23-year-old woman, suffered multiple fractures.
The crash is believed to have been a head-on collision between two cars.
All three were rushed to hospital following a major operation by the emergency services.
In a statement this evening Gardai said: “Gardaí in Letterkenny are investigating a two car Fatal Road Traffic Collision which occurred at Callan, Drumkeen, Co Donegal (Main Ballybofey to Letterkenny Road on the N13).
“The collision happened at approximately 23.59hrs on Wednesday 11th July 2012.
“The 18 year old male driver of one of the cars (sole occupant) died this afternoon at Letterkenny GeneralHospital as a result of his injuries. The 38 year old male driver and 23 year old female passenger of the other vehicle where injured however it’s believed their injuries are not life threatening.
“The road was closed to facilitate an examination by Garda Forensic Collision Investigators but has since reopened. Gardaí are appealing to witnesses to contact Letterkenny Garda Station on 074-9167100, The Garda Confidential Line 1-800-666-111 or any Garda Station.”
Relatives and friends of Shane are comforting his mum and dad Julie and Martin and younger siblings Jason and Deena.
Shane had just completed his Leaving Cert at St Columba’s in Stranorlar and was working in a local service station.
The crash had led to the complete closure of the road from the Dry Arch roundabout to the Kilross junction close to Stranorlar. It was reopened an hour ago.
The closure had led to traffic problems in the area with many people trying to find alternative routes to and from Letterkenny and to the Twin Towns and beyond.
Garda forensic crash investigations spent the day at the scene.