A 67-year-old Burger King customer died after being punched by a 20- year-old employee of the restaurant chain.

The customer who fell and hit his head later died. The death has been ruled a homicide police said.

An autopsy determined that Paul Cannon died from blunt force trauma to the head according to Dennis Niemiec, a spokesman for the Wayne County medical examiner's office in Detroit.

An earlier report suggested the punch may have caused Cannon to choke on his dentures, However that was proved incorrect.

The employee who is in custody could face criminal charges. Police said Cannon was reportedly causing a disturbance Thursday afternoon at the restaurant on the city's east side and tried to hit the worker, who swung back.

Police believe he was homeless.