A college baseball pitcher shot to death Saturday in San Francisco while reportedly playing Pokemon Go has been identified, police said.

The victim, 20-year-old Calvin Riley, was shot in the chest just before 10 p.m. at Aquatic Park near Ghirardelli Square and was pronounced dead at the scene, police said. Riley graduated from San Mateo's Junipero Serra High School and was a baseball pitcher at San Joaquin Delta College in Stockton.

Family friend John Kirby said they were devastated.

"Calvin got a few steps ahead of his buddy," Kirby said. "He went around the corner, and his buddy heard gunshots. It seems to be a random act of violence - for no reason."

Investigators on Sunday said the suspect is still at large and they were still trying to piece together how it happened.

"U.S. park police are on alert," said Lynn Cullivan of the National Park Service. "They will be paying close attention to this area. They do patrol it regularly. ... Like we say, this was an unusual occurrence, and we will do everything we can to make sure it doesn’t happen again."

According to a Go Fund Me page set up in Riley's honor, he was playing the popular Pokemon Go game on his phone at the time of the shooting.

Kirby remembered Riley as someone who liked to build people up.

"He always had positive things to say about everyone," Kirby said. "Amazing work ethic, great baseball player and represented Serra High School very well."

The park police could not confirm that Riley was playing Pokemon Go when he was gunned down.

No arrests have been made in connection with the shooting, and police are continuing to ask the public for help in tracking down any additional information or suspects, police said.

Anyone with information about the shooting is asked to call the U.S. Park Police tip line at 415-561-5150.