Mr. Greer was a Rittenhouse sleeper agent that was sent back to 1934 to kill a 17-year-old John F. Kennedy before he ever became president. He worked at Kennedy's boarding school as an English teacher, and asked to talk to Kennedy when he was walking down the hall with his friend, Lem Billings. He asked Kennedy to close the door, and began to take a gun out of a desk drawer. Before he was able to murder Kennedy, he was shot do death by Garcia Flynn.

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