upon their oaths aforesaid do say that. . .they did then and there find the body of Basil M Boone of said District, prostrate upon the ground with his face upwards with a mortal wound in his forehead, which we believe was inflicted by a Rifle ball, finding a rifle gun there lying, with the muzzle, under the left leg of the deceased ... we believe that the said Basil M Boone ... himself did shoot and Kill