Just two or three hours later, the mother realized that her son was still locked in his car seat, Gonzalez said. “This time the child did not succeed again with the activities for which they were preparing, it took some time for them to notice that the child was not at home,” Gonzalez told KTRK. Early correspondents found that the child was dead at the scene, the sheriff said. It is unclear whether the mother will face charges, KTRK reported. Temperatures in Houston reached a record high on Monday as Houston Hobby Airport reported a high temperature of 101 degrees, according to CNN Weather. While the boy knew how to solve it, investigators believe he was unfamiliar with the vehicle because it was a rental car. “The door did not have any kind of child lock or anything like that,” Gonzalez said. On average, 38 children under the age of 15 die each year from heatstroke after staying in a car, according to the National Safety Council (NSC). Children’s body temperature rises much faster than adults and may begin to suffer heatstroke when their temperature reaches 104 degrees. A body temperature of 107 degrees can be fatal, according to the National Highway Traffic Safety Administration (NHTSA). The majority of child deaths from hot cars occur because the child is forgotten by a caregiver, according to data compiled by Jan Null, a lecturer in the Department of Meteorology and Climate Science at the University of San Jose. While the hottest months account for the most deaths, hot car deaths in children are a persistent problem every month and almost every state has reported an incident since 1998, according to the data. NHTSA advises caregivers to never leave unattended children in a car, even if the car is running on air conditioning or the windows are cracked. The agency also advises that people tend to check the front and rear seats of a car before leaving it and place a personal item such as a wallet or briefcase in the back seat to make sure someone is checking it before leaving. CNN’s Elizabeth Wolfe contributed to this report.