 He died over a year later on July 28, 1655, aged 36, at the house of his cousin, Pierre De Cyrano, in Sannois.He was buried in a church in Sannois.However, there is strong evidence to support the theory that his death was a result of a botched assassination attempt as well as further damage to his health caused by a period of confinement in a private asylum, orchestrated by his enemies, who succeeded in enlisting the help of his own brother Abel de Cyrano.