There are a number of saints named Isidore and all died natural deaths.
St. Isidore the Farmer's feast day is May 15th. Along with his wife St. Maria.
There are a number of saints named Isidore. You need to be more specific.
St. Isidore of Seville is the patron saint of the Internet.
Isidore Lynch died in 1841.
Isidore of Chios died in 251.
Isidore Pils died in 1875.
Isidore Dyen died in 2008.
Isidore Salmon died in 1941.
Isidore Loeb died in 1892.
Isidore Barbarin died in 1960.
Elder Isidore died in 1908.
Isidore Frégeau died in 1906.