Girl, 5, shoots and kills little sister, 3, after dad left loaded gun on kitchen counter

A five-year-old girl fatally shot her little sister after their father reportedly left his loaded gun on the kitchen counter before he headed to bed.

Olivia Melo Moreira, 3, was found dead by her parents Sunday morning on the floor of their Rio de Janeiro home — as her stunned sister ran toward them repeatedly saying “Sorry, Daddy,” the devastated father told police, according to The Sun.

Moreira was rushed to a local hospital where she succumbed to her injuries, O Globo reported.

The dad, a licensed gun owner who has not yet been identified, was interviewed by police.

He was not immediately arrested but is expected to be charged with involuntary manslaughter and failure to exercise proper caution with a firearm, according to The Sun.

“At this very delicate and tragic moment, the family has no interest whatsoever in making a statement,” the dad’s attorney told reporters.

The little girl’s family had been out late for a street party that went on until 6 a.m. Sunday morning. When they returned to the house, Moreira’s mother noticed the garage gate was wide open and alerted her husband, who took his pistol downstairs to check whether anyone had broken in.

He found no burglars and went back to bed — but tragically left the loaded pistol, still in its holster, on the kitchen counter.

A loud bang awoke the parents who discovered their daughter on the floor.

The father had registered the weapon as a licensed sports shooter and hunter.

Police have seized the gun and the investigation remains ongoing.