Steve Mack/Getty
June 09, 2014 11:45 AM

The truck driver charged in the crash that left Tracy Morgan in critical condition had been awake for more than 24 hours before hitting the road, according to the criminal complaint in the case.

Kevin Roper of Jonesboro, Georgia, was behind the wheel of a Walmart truck early Saturday, when police say he caused a six-vehicle pileup on the New Jersey Turnpike.

In a criminal complaint obtained by PEOPLE on Monday, New Jersey State Police say Roper, 35, drove “without having slept for a period in excess of 24 hours.”

Kevin Roper
New Jersey State Police

During the accident, the limo bus carrying Morgan and his friends flipped over, seriously injuring the former 30 Rock star and two other passengers and killing comedian James “Jimmy Mack” McNair.

Roper now faces charges including vehicular homicide, auto assault and reckless driving. He is expected in court on Wednesday.

In a statement Saturday, Walmart president and CEO Bill Simon said that “if it’s determined that our truck caused the accident, Walmart will take full responsibility,” adding that road safety is “our absolute highest priority.”

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“This is a tragedy and we are profoundly sorry that one of our trucks was involved. We are working quickly to understand what happened and are cooperating fully with law enforcement to aid their investigation,” he said.

Morgan, 45, remains in critical condition but is more responsive after undergoing surgery Sunday, progress his rep called “an incredibly encouraging sign.”

With reporting by DIANE HERBST

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