Baltimore City’s Inspector General Hilton Green launched an investigation last week into the controversial death of Robert Lee Clay, the prominent Maryland contractor who was found shot to death in his Reservoir Hill office in 2005, according to a high-ranking source familiar with the probe.

Green interviewed several employees in the State’s Medical Examiner’s office about the autopsy of Clay last week, the source said. The autopsy report indicates Clay shot himself in the back of his head on the left side on May 16, 2005.