A man reported missing last month was found dead Thursday morning in northwest Indiana.

Authorities were called at 8:31 a.m. when an employee of Horizon Bank, 4208 Calumet Ave. in Valparaiso, Indiana, discovered a man’s body, according to a statement from the Porter County Coroner’s Office. The man was identified as 59-year-old Donald Gildersleeve.

Gildersleeve was reported missing Dec. 30, according to the coroner’s office and Valparaiso police. He was last seen about noon or 1 p.m. that day at the Burger King at 2921 Calumet Ave. in Valparaiso.

An autopsy Friday morning found that Gildersleeve died of natural heart-related causes, the coroner’s office said.