Newton County Sheriff's investigators are on the lookout for Courtney Thornton who allegedly shot a man in the back of the head and robbed another early Tuesday morning.

Thornton, 25, reportedly shot Dennis Rogers, 38, while the pair were passengers in a green 2001 Jaguar S-class shortly before 4 a.m. Tuesday. The shooting occurred on Gum Tree Trail about 100 yards from Thornton's residence. What exactly happened after the victim was shot is still under investigation, but NCSO Lt. Bill Watterson said the driver of the Jaguar was able to escape from Thornton and later made contact with a NCSO deputy at the Kroger on Salem Road.

Deputies later found Rogers still alive slumped in the Jaguar. He was life flighted to Atlanta Medical Center where he is listed in critical condition.

Watterson said more information surrounding the case is currently being withheld until an arrest has been made. When Thornton is arrested, he will be charged with aggravated assault, armed robbery, possession of a firearm during a felony and possession of firearm by a convicted felon. If the victim dies, Watterson expects Thornton would be charged with murder.

Anyone with information regarding the shooting is asked to call the Newton County Sheriff's Office at (678) 625-1403. Tips may also be given anonymously at (678) 625-5007 or on their Web site www.newtonsheriffga.org.