BEAUFORT, N.C. -- Authorities say an 11-year-old girl visiting her father in North Carolina was killed when the 20-gauge shotgun he was unloading went off.The Carteret County Sheriff's Office said Tuesday that 35-year-old Michael Lee Wynne II of Beaufort called 911 for help late Monday afternoon, but authorities say the girl was pronounced dead at the scene when emergency personnel arrived. Officials say Wynne's 12-year-old sister was also in the room at the time of the accident.Both girls had arrived the day before from Arkansas to spend the summer with their father.The sheriff's office is investigating the incident, which will also be reviewed by the district attorney's office. No charges have been filed so far.