Nourrit's fame faded in the late 1830s, however, as new singers gained the favour of the Parisian public. In October 1836, impresario Duponchel engaged Gilbert Duprez, who commanded an exciting high C from the chest, as joint "First Tenor" with Nourrit at the Opéra de Paris. Nourrit accepted this arrangement as a hedge against his falling ill. He sang his "Guillaume Tell" part exceptionally well with Duprez in the audience on 5 October 1836 but five days later, during "La muette de Portici", with Duprez again in the house, he suddenly went hoarse. After the performance, Hector Berlioz and George Osborne walked Nourrit up and down the streets as he despaired aloud and talked of suicide. On 14 October, he resigned from the Opéra.