BATON ROUGE - The autopsy of a man who died at a Baton Rouge area wastewater treatment facility has revealed a heart condition as the cause of death, according to the East Baton Rouge Coroner's Office.

57-year-old Michael Preston was pronounced dead at the scene on Saturday afternoon at the Baton Rouge Wastewater Treatment plant in the Gardere area.

Initial reports from EMS said Preston was driving a lawnmower before it was believed he fell into the water and drowned. The sheriff’s office confirmed that a worker was “working on some equipment” and fell.

On Monday afternoon, the EBR Coroner’s Office performed an autopsy, eventually attributing Preston’s cause of death to hypertensive and atherosclerotic heart disease.