10-year old Illinois boy unintentionally killed by 7-year old sister handling unsecured rifle

10-year old Christian Clark and his sister, 7-year old Halee Clark, were playing in their grandfather's hunting RV, in Dix, Illinois.  There were a number of unsecured guns in the RV.  Halee picked up a loaded rifle and unintentionally discharged it, striking her brother in the head and killing him.

From an article:

The initial investigation indicates the victim and his seven-year-old sister, Halee Clark, were inside the motor home that is used as a hunting cabin when young Halee picked up a long gun.  Jefferson County Coroner Eddie Jo Marks says a round accidentally discharged and struck Christian in the head, resulting in his death. 

Marks says there were a few guns laying out and the one the young girl picked up contained just the one shell that resulted in her brother's death.  Marks reported the girl immediately left the vehicle to tell family members that her brother had been hurt.  Christian was pronounced dead on the scene.

Mulch says the initial investigation indicates that the recreational vehicle is owned by the grandfather of the two children, Jason Clark, Senior.  He is also from Granite City.   

(a related article)

Every gun in the hands of a child must first pass through the hands of an adult.