The body of a young man in his early 20s was discovered early yesterday inside a van which was submerged in Lough Muckno, a few miles from Castleblayney, Co Monaghan.
Gardaí are investigating how the the vehicle went into the water from a roadway near the lake.
The victim, who was pronounced dead at the scene, was identified as a single local man from the Castleblayney area.