In summer 1615, however, it emerged that Overbury had been poisoned. He had died on 15 September 1613 in the Tower of London, where he had been placed at the king's request. Among those convicted of the murder were Frances and Robert Carr, the latter having been replaced as the king's favourite in the meantime by Villiers. James pardoned Frances and commuted Carr's sentence of death, eventually pardoning him in 1624. The implication of the king in such a scandal provoked much public and literary conjecture and irreparably tarnished James's court with an image of corruption and depravity. The subsequent downfall of the Howards left Villiers unchallenged as the supreme figure in the government by 1619.