A five-year-old Texas boy died Monday after being left inside a sweltering vehicle for several hours as his family prepared for a party, authorities said, the latest hot-car-related death involving a minor in the United States.

According to Harris County Sheriff Ed Gonzalez, the child was in the car for about two to three hours as his family purchased items at a store for his 8-year-old sister’s birthday. The boy, who was not identified, was pronounced dead on the scene.

The sheriff’s office said Tuesday that investigators responded to the scene and the case is open, The Associated Press reported. The office said investigators will meet with the district attorney’s office to present their findings.

The boy is the fifth child to die in a hot car in the U.S. this year, Texas Heatstroke Task Force chair John Humphreys told USA TODAY on Monday. This is the second hot car-related death in Texas in 2022, Humphreys said. . 

On average, 39 children die in a hot car-related death each year in the U.S., according to the nonprofit child safety organization Kids and Car Safety. The organization has reported that more than 1,000 children have died in hot cars since 1990.

“As we move into the summer and these really hot days, we want to bring awareness, we want people to take safety precautions and create habits in their everyday lives, to prevent this from happening,” Amber Rollins, director of Kids and Car Safety, told USA TODAY on Tuesday.

‘FORGOTTEN BABY SYNDROME’:There’s science behind why parents leave kids in hot cars

A majority of hot car-related deaths are accidental. Nationally, about 53% of hot car-related deaths are a result of the child being forgotten and left unattended in vehicles, according to Humphreys. 

About 26% of hot car-related deaths are due to the child gaining access to an unlocked vehicle and 20% of deaths are because a child is knowingly left in a vehicle, Humphreys said in an email.