Nearly a decade after a college baseball player was murdered, federal investigators have announced a new development they hope could help find the killer. 

On Tuesday, federal investigators released a new sketch of a second person believed to be involved in the killing of Calvin Riley. 

Riley, 20, a rising baseball prospect for the San Joaquin Delta College Mustangs, was gunned down at Aquatic Park in San Francisco on the evening of Aug. 6, 2016, while he was playing Pokémon Go with a friend.

Riley and a friend were walking near the end of the promenade when Riley was struck by a bullet that had a north-to-northwest trajectory, according to the FBI.

Calvin Riley poses after a baseball game with his parents. (Justice for Calvin Riley Facebook)

He told the outlet Tuesday he hopes this new information “marks a turning point in the case” and praised the FBI for continuing to try to bring justice for his son’s death.

“I think they’ve, they’ve done an outstanding job,” Riley said, acknowledging agents had been working tirelessly on the case. “It’s been a lot. I mean, it has been nine years.” 

Calvin Riley, originally from Boston, was a standout pitcher who dreamed of playing for the Red Sox and was also a fan of the San Francisco Giants, according to KTVU.

“There’s not a day, hour, minute or second that we don’t think about you and the great memories that you left us with. Calvin, we promise you that we will find this person and bring them to justice. Cal we love you and miss you so much. Until we all meet again!!!” the family wrote in a post on a Facebook page dedicated to bringing justice to Riley. 

The FBI is offering a reward of up to $25,000 for information that leads to identifying and establishing probable cause to arrest the individual(s) responsible for Calvin Riley’s murder.

Anyone with information is urged to contact the FBI’s San Francisco Field Office at 415-553-7400 or submit a tip online at tips.fbi.gov.

Stepheny Price is a writer for Fox News Digital and Fox Business. She covers topics including missing persons, homicides, national crime cases, illegal immigration, and more. Story tips and ideas can be sent to stepheny.price@fox.com