The accident happened around 6:30 Saturday night in the 900 block of East 214 Street.
Joshua Saunders was doing what most kids do on a summer Saturday evening - playing outside with his seven year old brother.
"We were playing baseball and he was hit right there, and the car was going fast," Nathan Saunders said.
At the same time, witnesses in the Williamsbridge section of the Bronx say little Joshua ran out of his front yard and onto East 214th Street retrieve his baseball.
"My back was turned for two minutes. Not even. Two seconds. All I see is somebody saying 'Joshua, Joshua,'" Arantxa Saunders, the victim's sister, said.
"I was sitting up there. I heard the impact. He was thrown under the truck, Exton Wynter said.
Witnesses say the five year old was thrown about 30 feet underneath a blue pickup truck.
His older sister ran to him.
"He was just laying there. He wasn't breathing at the time. And my niece picked him up," Livington Brown said.
"When he got hit, I was there beside him. I was there looking him in his face like, 'Bro, get up,'" Arantxa said.
She says he took a deep breath, but couldn't get up on his own and left in an ambulance.
Police are looking for an older model Nissan Pathfinder. They believe it is green.
Josha was listed in critical condition at Jacobi Hospital late Saturday night.