A man died after he came off his motorbike during an off-road event near Cranford at the weekend.
The man was from Northern Ireland and is in his 50s.
The man was found unconscious by colleagues at around 1.45pm on Saturday and was lying beside his motorcycle on a mountainside dirt track.
He was taken to Letterkenny University Hospital by helicopter, but was pronounced dead.
Gardai say a post morten examination will determine the direction of the investigation.
