A Mulberry Grove man has been charged with first degree murder. The charge against 28-year-old Demetrice Lockett alleges that on Christmas morning he fatally shot 26-year-old Leroy Roberson Jr. of Mt. Vernon. The shooting occurred during an argument between the two men in the parking lot of a Mt. Vernon liquor store. Lockett was arrested by a state trooper after he was seen running from the scene. He is being represented by a Marion County Public Defender. Lockett will be in court next on January 19 for a preliminary hearing and his first appearance with counsel.