Sometime in the middle of November 1798, Muir moved incognito to Chantilly. On 26 January 1799, he died there, suddenly and alone, with only a small child for company. So tight had his security been that not even local officials knew of his presence or identity. No identifying documents or papers were found on his person and his name was discovered only when the postman remembered delivering newspapers to him addressed to 'Citoyen Thomas Muir'. Several days later, when the news of Muir's death reached Paris, a brief obituary notice was inserted in Le Moniteur Universel saying that he had died from a recurrence of his old wounds.