Kevin Roper, the 35-year-old truck driver who was reportedly dozing at the wheel when his tractor trailer crashed into Tracy Morgan's limo bus early Saturday morning, turned himself in Saturday night, a spokesperson for the NJ State Police said. He was charged with one count of death by auto and four counts of assault by auto.

According to TMZ, after a $50,000 bail was set for Roper, he was released after only a few hours.

The crash, which happened on the New Jersey Turnpike near Cranberry Township, killed James "Jimmy Mack" McNair, a comedian and mentor of Morgan's, and critically injured three others. Roper had been driving a Walmart 18-wheeler at the time of the accident. Walmart president and CEO Bill Simon said in a statement:

"This is a tragedy and we are profoundly sorry that one of our trucks was involved. . . . The facts are continuing to unfold. If it's determined that our truck caused the accident, Walmart will take full responsibility."

Morgan, as well as comedian Ardie Fuqua and Morgan's assistant Jeffrey Millea, are all still in critical condition at Robert Wood Johnson Hospital. According to the Associated Press, Harris Stanton, another comedian, was treated and released from the hospital on Saturday.

Four other vehicles were involved in the crash but no one else has been hurt.

[Image via AP]