A Georgia girl died this week after her younger brother accidentally shot her in the head, police say.

Investigators say the mother of a girl identified in media reports as Millie Drew Kelly loaded her and her 4-year-old brother into a car Monday at their Paulding County home, but couldn’t get it to start. When the mother left the vehicle to see what was wrong, she heard a shot fired from inside it, they added.

"Detectives determined that the 4-year-old male sibling retrieved a handgun from the console of the vehicle and accidentally discharged it, striking his 6-year-old sister in the head, fatally wounding her," the Paulding County Sheriff's Office said in a statement.

The girl was rushed to a local Atlanta hospital but died of her injuries two days later. As of now, detectives don’t plan on filing any charges in the case.

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“Our hearts break for this family and we hope God puts his healing hands around them during this difficult time,” Sheriff Gary Gulledge said in a statement. “We want to remind everyone to keep their firearms unloaded and secured in an area away from children to ensure that this never happens again.”

A GoFundMe page set up to offer financial support for the family has raised over $30,000 as of Friday morning.

Fox News' Michael Sinkewicz contributed to this report.