Stephen McElwaine, 34, was taken to Letterkenny General Hospital for treatment following the single vehicle crash on the Drumkeen to Stranorlar road at Ballinaglack at 9.40pm.
Two other men travelling in the van were treated at the scene for minor injuries.
Mr.McElwaine, from Convoy, died a short time ago at Letterkenny General Hospital
A full investigation has been launched into the crash.
It is believed the van in which Mr McElwaine was a passenger flipped over onto its roof.
Garda forensic experts spent Sunday examining the scene.
Mr McElwaine’s mother was on holidays in Canada when she learned of the incident and arrived home today.
Anyone with information is asked to contact Letterkenny Garda station on (074) 9167100, Ballybofey Garda station on (074) 9137740, or the Garda Confidential Line on 1800 666 111.Tags: