In Northwoods, Missouri, a 15-year old boy accidentally shot his 12-year old sister, Nakyah Durham.  She was pronounced dead at the scene.

The boy was handling a firearm when it accidentally discharged.  He has been arrested and charged with involuntary manslaughter.

Source:

Associated Press, “Police: 15-Year-Old Accidentally Shot 12-Year-Old Sister,” US News and World Report (March 20, 2020).