Who executed the French diplomat-Joseph Coulon de Villiers, sieur de Jumonville?

When word reached Fort Duquesne about the incident, Jumonville's half brother, Captain Coulon de Villiers, vowed revenge. He attacked Washington and the garrison at Fort Necessity and forced them to surrender on July 3, 1754. In the surrender document, written in French, Coulon de Villiers inserted a clause describing Jumonville's death as an " assassination"