The victim was found shot to death Thursday morning, with his car found crashed nearby, police said.
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Surveillance video shows a girl, whom police are calling a person of interest in the case. Authorities said they are looking to identify and speak with the girl.
WATCH: Video shows person of interest in case of body found in park, police say
Video shows person of interest in case of body found in park: police
The shooting happened before 2:30 a.m. on Satsuma Street near Red Bluff Road, not far from Sparks Elementary School, police said.
Officials add that the 19-year-old showed up at the park at about 1:30 a.m. in his car. Investigators said at least three people showed up to meet with him, and that's when the victim was shot to death.
The purpose of the meet-up and what exactly led up to the shooting are unknown.
The victim tried to drive away after he was shot but crashed into a line of trees, police said. It's unclear if he was shot inside or outside of the vehicle.
The suspects then dragged the 19-year-old's body out of the car and about 100 yards away to a nearby wooded area behind an auto body shop and a church.
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Investigators believe the suspects took off on foot.
The 19-year-old's mother was trying to find her son and tracked him by GPS to the crime scene. When she arrived, she saw his car surrounded by crime scene tape.
"We do know that his mom was tracking him and that she came out here, and that's when she found the tape, obviously, and saw you guys (the media) out here. That's what we know so far," Sgt. Raul Granados said. "We are talking to his mother right now. We're trying to get further information about, maybe she knows who he was meeting up here and what was happening prior to the shooting."
Investigators were searching for surveillance video in the area, trying to form a description of the wanted suspects.
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