Duncan police say it happened just before 9:00 last night on Main Street near Second Street.
Officials say 15 year old Hunter Vaughn, and his mother 36- year old Christine Vaughn walked in front of a vehicle going eastbound.
They were both transported to Duncan regional hospital and were later taken to Oklahoma University Medical Center.
Duncan police say they were notified this morning of Hunter's death, his mother though remains in critical condition. The accident remains under investigation.