Hewlett later brought up his death to a wounded Simcoe, with the intention to take revenge on him, but decided to have mercy and decided to let Simcoe live.
In 1777, at the church in Setauket, Simcoe told Hewlett that spies had been operating under their noses. Hewlett then said that Simcoe lacked evidence and still hasd't found the Patriot petition.
Hewlett then fed Bucephalus half of an apple. While Hewlett's back was turned, Simcoe secretly fed Bucephalus another half of an apple. Almost immediately, Bucephalus bucked violently around the room, then collapsed and writhed on the ground. Hewlett, seeing that his horse was suffering, shot him dead.
A doctor later examined Bucephalus and suspected poison. Simcoe suggested that Hewlett was the intended target and volunteered to investigate Lucas Brewster, who sold the apples to Hewlett.
In 1781, after Simcoe had been wounded in a confrontation with Abe, Hewlett approached him on the H.M.S. Bonetta with a dagger drawn. Hewlett stuffed an apple in Simcoe’s mouth and recalled his beloved Bucephalus and when Simcoe killed him a poisoned apple. Hewlett then ordered Simcoe to eat the apple in his mouth, which Simcoe thought was poisoned. Simcoe ate it and said that Hewlett’s transformation from weakling to warrior had been his greatest creation.
Hewlett then took a bite of the apple, revealing that it was not poisoned. Hewlett then said that he still wanted to kill Simcoe, but changed his mind after having heard Simcoe protecting his Rangers earlier, and he had decided to put their feud behind him. Hewlett then stuffed the apple back in Simcoe’s mouth and left. Simcoe then sobbed alone.