When King Narai was seriously ill with no hope of recovery, Phetracha arrested Constantine Phaulkon and the French officers. After questioning Mom Pi, he discovered Mom Pi had conspired with Phaulkon to assume the throne, and Mom Pi was executed. Further questioning of Phaulkon revealed a plot to raise a rebellion, and he too was executed. Narai, on his deathbed, was unable to do anything, except curse Phetracha and his son, Luang Sorasak. Luang Sorasak then had Narai's two brothers executed.