EDISON - A spokesman says actor Tracy Morgan is “more responsive” and has undergone surgery for a broken leg following a crash on the New Jersey Turnpike that killed one of his friends.

The comedian also suffered a broken nose and broken ribs in the six-car crash. His spokesman says Morgan will remain in the hospital for several more weeks.

Meanwhile, the driver who police say is responsible for the deadly crash surrendered to police on Sunday. He is expected in court on Monday.

Police say Kevin Roper, of Georgia, was driving the Wal-Mart tractor-trailer that hit a coach bus carrying Morgan and at least six others, causing it to flip over. Roper is charged with one count of death by automobile and four counts of assault by automobile.

Morgan's bus was returning from a performance at Dover Downs in Delaware Friday night when the crash happened.

The man who died in the crash was James McNair, also known as Jimmy Mack, a comedian who is one of Morgan's writers.

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Morgan's assistant, Jeffrey Millea, was also in the bus and is in critical condition, as is Jersey City comedian Ardie Fuqua. Comedian Harris Stanton was treated and released.

The National Transportation Safety Board is now investigating the crash.

Wal-Mart President Bill Simon said in a statement that the company "will take full responsibility" if authorities determine its truck caused the accident.

Atlantic Transportation Services, the limousine company operating the bus, released a statement offering prayers and condolences to those involved in the accident.