A man's body was found in Mayport Saturday morning, according to the Jacksonville Sheriff's Office.
Police said Monday that no foul play was suspected in the death of 29-year-old Matthew Dillon.
Sometime before 10 a.m. Saturday, Dillon was found lying close to the woods near Mayport Middle School.
Homicide detectives said he had no visible trauma wounds.
Detectives waited for the arrival of the Medical Examiner's Office to determine the cause of death.