Comedian/Actor Tracy Morgan, best known for his work on Saturday Night Live and 30 Rock, is in critical condition after a multi-car wreck on Saturday morning that killed one of his fellow passengers.

Morgan was in a limo bus leaving a comedy gig in Delaware when the bus was apparently rear-ended up a drowsy Wal-Mart truck driver, causing the bus to flip. Three passengers, including Morgan, are in critical condition, and one passenger, 63 year-old comedian James McNair, was killed in the collision.

Police have arrested the driver of the semi that hit the bus, and he's currently being held in lieu of bail.

Morgan remains in critical condition but has demonstrated some responsiveness. More details to follow as updates come our way.