The O’Rourke family confirmed his death in a short statement Wednesday evening.
The family statement said: “It is with deep sadness that the family of Des O’Rourke confirm his passing earlier today.
“Des had been ill for a short period of time and passed away surrounded by his immediate and extended family.
“The O’Rourke family now asks for privacy to help us overcome this loss.
“May Des rest in peace.”
Des O’Rourke was a shareholder and founding co-director of the Laing O’Rourke Group with his brother Ray.
Des was known for his project management skills, mobilizing large teams of people on complex projects across the world.