Okaloosa County, FL -- A seven-week-old baby is dead after deputies say the child was left in a family vehicle for several hours.

Read: 11-Year-Old Boy Invents Device To Prevent Hot Car Deaths

It happened in Okaloosa County Sunday. Deputies received a 911 call at around 9:30pm when the child was found dead by a family member inside a van at a home in Mary Esther.

Read: What You Need To Know About Leaving Your Child In The Car

According to deputies, the family member who discovered the child was not aware that the child’s mother had put her in a rear-facing car seat in the vehicle after church at around 12:45pm.

Read: Tips to prevent hot car deaths

An investigation is underway.