 On 9 January 1809 Álvarez was brought to the castle of San Fernando in Figueres, where he was found dead the following day, of a fever according to the French, poisoned, according to the Spanish.He was buried, wrapped in only a sheet, in the cemetery there.He was posthumously promoted to Field Marshal in April 1809 and made a Commander of the First Battalion of the Spanish Royal Guards Regiment in May 1810.