Actor Tracy Morgan attends the FX Networks Upfront premiere screening of "Fargo" at the SVA Theater in this April 9, 2014, file photo taken in New York. Morgan is in critical condition at a hospital in New Brunswick, N.J. Saturday morning, June 7, 2014, following a violent multi-vehicle crash on the New Jersey Turnpike overnight.

NEW BRUNSWICK, N.J. - Actor and comedian Tracy Morgan is showing signs of improvement following a New Jersey highway crash that badly injured him and killed one of his friends.

Spokesman Lewis Kay said Thursday that Morgan remains hospitalized in critical but stable condition but his medical team is "optimistic that his recovery is progressing."

Kay says Morgan's fiancee is by his side and is relaying to him everyone's prayers and good wishes.

The 45-year-old former "Saturday Night Live" star suffered broken ribs and a broken leg in the Saturday morning crash. The crash killed fellow comedian James McNair and seriously injured two other people.

Prosecutors say Wal-Mart driver Kevin Roper's truck hit Morgan's limo. The Georgia resident has pleaded not guilty to death by auto and assault by auto charges.