A front seat passenger in the truck a 17-year-old male, also from West Valley City suffered non-life-threatening gunshot wounds to his arm and torso, according to Keller.
Also in the vehicle were three other males and two females, ages 13 and 19.
"It looks like it happened quickly," Keller said, noting the vehicle was parked in the traffic lanes with its doors found open. The six surviving occupants fled south on foot on State Street. A group of three or four people was seen leaving the scene to the north, into an alley.
"We'd like to talk to them," Keller said of the northbound group.
Other abandoned vehicles were found in the road; they belonged to other witnesses who fled the gunfire, Keller said.
Investigators believe someone fired at the pickup from Helm Avenue or from the adjacent alley, Keller said. Police are withholding the victim's name pending family notification.
Anyone with information on this case is asked to called SSLPD at 801-840-4000.