Actor and comedian Tracy Morgan is in critical condition after his limo bus was involved in a six-car accident on the New Jersey Turnpike early Saturday morning, according to state police. One person was killed and four others are in critical condition.

The accident involved two tractor-trailers, an SUV, and two cars, in addition to the limo bus, Sgt. Gregory William of the New Jersey State Police said. The four injured, including Morgan, are being treated at the Robert Wood Johnson University Hospital in New Brunswick, N.J.

The comedian had performed Friday night at the Dover Downs Hotel and Casino in Dover, Delaware.

UPDATE [2:26 pm]: A dozing truck driver reportedly caused the crash that killed comedy writer James McNair and injured Tracy Morgan and three others. According to ABC News, a driver of an 18-wheeler didn't see traffic slowing in front of him until it was too late. Two other victims in the crash have been identified as Ardie Fuqua and Harris Stanton.

UPDATE [11:57 am]: The victim killed in the crash this morning has been identified as James McNair, Tracy Morgan's longtime friend and comedy writer. Morgan's assistant, Jeff Millea, is also in critical condition, according to an official in the investigation.

UPDATE [9:22 am]: Comic Ardie Fuqua was reportedly one of the passengers on Morgan's limo bus. He added this picture and caption to Instagram early Saturday morning, just before the crash: "This is what it looks like from the stage to see a standing ovation from 1500 people. Then we traveled back to NYC in style in a luxury Mercedes Sprinter. Road life is a good life! #tracymorgan"

[Image via AP]