Suspect sketch released in SF slaying of Pokémon Go player

The hunt for the killer of a 20-year-old man shot to death in August while playing Pokémon Go at San Francisco’s Aquatic Park took a major turn Wednesday when investigators released a sketch of a potential suspect.

U.S. Park Police asked the public for help in identifying the man in the composite sketch of a possible suspect and released a photo of 2013 to 2015 white Toyota Avalon four-door car spotted leaving the scene shortly after the shooting of Calvin Riley, a baseball player at San Joaquin Delta College in Stockton.

U.S. Park Police released a sketch of man wanted in connection with the slaying of Calvin Riley at San Francisco’s Aquatic Park in August 2016. U.S. Park Police released a sketch of man wanted in connection with the slaying of Calvin Riley at San Francisco’s Aquatic Park in August 2016. Photo: U.S. Park Police Photo: U.S. Park Police Image 1 of / 5 Caption Close Suspect sketch released in SF slaying of Pokémon Go player 1 / 5 Back to Gallery

Calvin Riley, from San Mateo, was reportedly playing Pokémon Go on the Aquatic Park promenade near Fisherman’s Wharf when he was fatally shot in the chest just before 10 p.m. on Aug. 6. He was pronounced dead at the scene.

Since the shooting, U.S. Park Police, which patrols the popular federal recreational area along Beach Street near Van Ness Avenue, have released little information in the case.

When the shooting happened, Sgt. Robert Jansing, an investigator with the U.S. Park Police, said he hoped investigators would be able to piece together what happened through surveillance footage and witness accounts.

For any information regarding the case, call the U.S. Park Police Tipline at (415) 561-5150 or U.S. Park Police Communications at (415) 561-5508.

Sarah Ravani is a San Francisco Chronicle staff writer. Email: sravani@sfchronicle.com Twitter: @SarRavani