WEBSTER, Texas -- A grand jury will reportedly hear the case of a 3-year-old boy who was found dead after being left in a hot car for more than 10 hours Wednesday afternoon.

It happened in Webster.

Police said that the boy's grandmother was supposed to drop him off at day care Wednesday morning, but apparently forgot. When she returned to her car in the 400 block of NASA Parkway 10 ½ hours later, she discovered the toddler strapped in his car seat.

Police said the grandmother arrived at work at a local locksmith around 7:30 a.m. and, because she didn't take a lunch break, didn't return to her car until 5:45 p.m. It wasn't until she was backing up did she notice the motionless child in her back seat, said police.

Temperatures in the area reached 89 degrees on Wednesday, with a heat index of 96 degrees.