A four-year-old boy was killed when his father was driving a malfunctioning vehicle without lights slowly on the South Loop Sunday night and was rammed by another driver.

Both drivers were drunk, police say.

The boy, whose name has not been released, was with his father, Jamal Green, 38, on the South Loop just west of I-45 Sunday at 10 p.m.

Police say the Nissan Sentra Green was driving “was either stalled out or moving very slowly in the northbound lanes of the South Loop East without its lights on.”

Jaime Rodriguez Reyes, 42, plowed his Chevrolet Lumina into the Sentra.

Reyes has been charged with driving while intoxicated and Green with felony driving while intoxicated with a child under 15.