Some time later Armstrong and his two servants, on their way to the Ohio country, passed by the cabin of Musemeelin, and his wife demanded the horse of Armstrong, but by this time he had sold the beast to James Berry.
Upon his return from a hunting trip his wife told Musemeelin of her demand to Armstrong. This angered the Indian, who determined on revenge.
Musemeelin engaged two young Indians to go on a hunting trip, but he led them to the camp of Armstrong and his men. When they arrived at a fire James Smith was sitting there alone. Musemeelin told Smith he wanted to speak with him privately, and they went into the woods. Musemeelin soon came back laughing, as he had killed Smith and shot Arnold, whom he found coming back to the camp.
The young Indians were terrified, but too afraid of Musemeelin to leave him. They soon came across John Armstrong sitting on an old log. Musemeelin asked: “Where is my horse?” Armstrong replied: “He will come by and by.” “I want him now,” said Musemeelin. “You shall have him. Come to the fire and let us smoke and talk together,” said Armstrong. As they proceeded, Armstrong in the advance, Musemeelin shot him in the back, then tomahawked him.
Shikellamy further said that the three Indians buried John Armstrong and that the others were thrown into the river.
Jacks Narrows, where this crime was committed, takes it name from Captain John (Jack) Armstrong, the victim.
Musemeelin was not convicted of the crime, but returned to his wigwam and was looked upon by his savage people as a hero.