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The body of a member of staff was found at a garage by colleagues.
The man, aged in his late 50s, was discovered at 3.55pm on Sunday, five minutes before closing time, at WJ King Vauxhall dealership in Maritime Close on the Medway City Estate, Strood.
Police officers were seen in the vicinity throughout Monday and on Tuesday.
It is believed the man worked as a driver at the company's numerous sites throughout Kent and south east London.
Spokesman Steve Knight said: "We were called at 3.55pm on Sunday following the death of a man at a business premises on the Medway City Estate.
"Officers attended but the death is not being treated as suspicious.
"The man's next of kin have been informed and a report has been prepared for the coroner."
WJ King were approached for comment.