MARION - Authorities are investigating the death of a Marion man who was found in Evergreen Cemetery on Tuesday.

According to the Sippican Week, Marion Police Chief John Garcia says that officers responded to the Mill Street Cemetery on July 31 at around 6 p.m. to reports that a deceased man had been discovered inside the grounds. A person passing through on a bicycle called Marion Police from a cell phone after discovering the body.

Marion Police are withholding the identity of the deceased, who authorities say had reportedly left his home at approximately 5 p.m. to walk his dog.

Chief Garcia says the passerby found the 63-year-old man's body lying on the ground of the east side of the cemetery. Initial indications are that he died of natural causes, possibly experiencing a medical emergency while walking the dog.

Marion Police and EMS units responded to find the body, and eventually found his dog nearby. Police also recovered the man's cell phone and contacted family members.

The Massachusetts State Police Detective Division, Marion Police Department, and the Office of the Medical Examiner are conducting an investigation into the death.