Investigators said the child was on the sidewalk before he attempted to turn at the intersection of Gallant Knight and South King Mill.
A woman driving a black Hyundai was traveling westbound on South Kings Mill and turned left to go south on Gallant Knight, according to DPS.
She told investigators she did not see the boy and struck him.
The child was transported to Kingwood Hospital in critical condition with CPR in progress. Authorities said he was pronounced dead at the hospital.
DPS troopers said the driver is cooperating with the investigation.