Actor and comedian Tracy Morgan, who was critically injured in a six-vehicle accident on the New Jersey Turnpike last week, has been showing signs of improvement but is still in critical condition, media reports said, citing the “30 Rock” star’s spokesperson.

The accident, which took place after Morgan's limousine bus was hit by a tractor-trailer Saturday, claimed the life of comedian James "Jimmy Mack" McNair, a friend of the former “Saturday Night Live” cast member, and injured four others, including Morgan. Authorities reportedly said that another semi-truck, an SUV and two cars were also involved in the accident.

"Today was a better day," Morgan's spokesman Lewis Kay, reportedly said, in a statement. "While Tracy remains in critical, but stable, condition, he continues to show signs of improvement. His medical team remains optimistic that his recovery is progressing.”

The 45-year-old star reportedly also suffered broken ribs and a broken leg. The driver of the truck, owned by Wal-Mart Stores Inc. (NYSE:WMT), has been arrested and has reportedly pleaded not guilty to the charges filed against him on Wednesday.

Kay also reportedly said that Megan Wollover, Morgan’s fiancée, has been beside him since the accident and “is relaying the countless good wishes and prayers that his family, friends and fans have been sending their way."

According to reports, two other passengers, Jeffrey Millea, Morgan’s assistant, and comedian Ardie Fuqua Jr., are also currently in critical condition, while another passenger Harris Stanton, who suffered from minor injuries, was released on Saturday.

Kevin Roper, driver of the Wal-Mart trailer truck, was reportedly charged for vehicle homicide and four counts of assault by auto and a criminal complaint against him stated that he had not slept for more than 24 hours before the accident. If convicted, Roper could face 18 months in prison for each count of assault by auto and a maximum of 10 years in prison for vehicle homicide.