Phoenix police said the deadly incident happened around 5 p.m. near 67th Avenue and Thomas Road.
The juvenile was found lying in the roadway in critical condition when officers arrived, police said.
The Phoenix Fire Department arrived and rushed the victim to the hospital, where they died from injuries.
The suspect vehicle was driving northbound on 67th Avenue when it hit the victim, who stepped off the sidewalk, police said.
The suspect vehicle is described as a four-door lifted maroon or faded red colored truck with a chrome strip across the door. It was last seen driving away from the scene, north on 67th Avenue.
On Monday, police identified the young victim as 8-year-old Jerel Glenn and said detectives are still looking for the suspect vehicle.
If you would like to help Jerel's family with funeral expenses, you can donate to their GoFundMe page here.
Anyone with information is asked to contact the Phoenix Police Department or Silent Witness (480-WITNESS or 480-TESTIGO for Spanish Speakers).
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Arizona's Silent Witness program allows people to send in tips and share information about crimes happening within their local communities.
The program shares unsolved felony case information in multiple ways, including TV, radio and social media.
Anyone who has information on a crime or recognizes a suspect described by the program is asked to call 480-948-6377, go to the program's website online or download the Silent Witness app to provide a tip. The identity of anyone who submits a tip is kept anonymous.
Calls to Silent Witness are answered 24/7 by a live person and submitted tips are accepted at all times. Submitted tips are then sent to the detective(s) in charge of the specific case.
Individuals who submit tips that lead to an arrest or indictment in the case can get a reward of up to $1,000.