Man, 21, dies after crashing into tree in County Monaghan 12 August 2013 Last updated at 21:45 A 21-year-old man has died in a road crash in County Monaghan He was driving on the N54 road at Aghnamallagh, Smithborough, when his vehicle collided with a tree. No other vehicle was involved in the crash, which happened at about 09:30 BST. The man was taken to Cavan General Hospital where he was later pronounced dead.