PORTLAND, Ore. – A 17-year-old boy was shot and killed at Holladay Park in Northeast Portland on Tuesday afternoon, police said.

The suspect fled after the shooting and is still at large, according to Portland police.

Police on Wednesday identified the victim as Shawn Scott Jr. of Vancouver, Wash. Scott was a junior at Union High School, according to an Evergreen Schools spokesperson.

The state medical examiner determined Scott died of a single gunshot wound.

The shooting occurred at about 4:30 p.m. Tuesday at the park across the street from the Lloyd Center Mall.

Dustin Gollyhorn was waiting for the MAX train at a nearby station when he heard the chaos and ran to the scene.

"What I saw was him so I jumped over the wall and ran to him as fast as I could...got my phone out, put it on the ground and I called 911 and put it on speaker and the lady said I had to put compression on his head," Gollyhorn said. "When I saw him, it was really bad. He had a hole in his head."

Police said they believe there were several witnesses who have not spoken to officers. Anyone with information should call Detectives Erik Kammerer or Mark Slater at 503-823-0400.

Crime Stoppers of Oregon is offering a reward of up to $2,500 for information that leads to an arrest in any unsolved homicide.