The victim, who was a driver with Taxi Diamond, was found unconscious in his car early Wednesday morning.
The 43-year-old suspect is five foot seven and weighs 200 pounds. He has blue eyes and mousy brown hair.
Police said they believe the suspect will be moving on foot or by public transit.
Police are asking for anyone with information about Duchaussoy's whereabouts to phone 911.
The public is warned not to approach the suspect.