College Athlete, 20, Shot Dead While Playing Pokemon Go at San Francisco Tourist Hot Spot

Cal Riley was apparently shot dead at random while at San Francisco's Fisherman's Wharf.

A young California man was shot dead Saturday while he was playing Pokemon Go at a San Francisco tourist hot spot, and his killer is on the loose.

Calvin Riley was using the wildly popular app at about 10 p.m. at Fisherman's Wharf when he was apparently shot at random.

The 20-year-old was walking on a promenade along the water when he was gunned down. Nothing was taken from Riley's person, leaving investigators puzzled over a possible motive, the San Francisco Chronicle reported.

Watch: 11 Robbed After Teens Lure Them To Remote Areas With 'Pokemon Go' Game

Sgt. Robert Jansing with the U.S. Park Police said Sunday that the shooting "makes no sense."

Now investigators are hoping witnesses could help them determine what happened.

“There’s a good chance someone saw something,” Jansing said.

Riley was to start his sophomore year at Delta College, where he was a member of the baseball team.

On a GoFundMe page created to offset funeral expenses. Riley's cousin, Gabriel Antonio Morales, recalls the moment the family learned of his death early Sunday.

Watch: See The Dangers Of The 'Pokemon Go' Game Everyone Is Obsessed With

"Due to this cruel world we live in, a part of my family was taken from us. When we got a call at 4:30 am saying he's gone I thought I was having a bad dream. We've had too many laughs, too many memories, too many moments that I will cherish for the rest of my life. 3x Lowell city champions!

"Calvin Riley you were my best friend. Nothing in the world will top the good times we've had together.  You were more than a cousin/best friend to me, you were my brother....You left me for California a couple years back. When you moved I balled [sic] my eyes out. Now what?

"You had the world in the palm of your hands! I know you moved out there to pursue your dreams of one day making it to the league and you had all the mechanics, talent and dedication to make your dreams a reality. But all that was taken by a coward who wanted to shoot up a poké stop. I wish I got to talk to you one more time. I would've told you how much I loved you and missed you. How bad I look forward to seeing you again."

Anyone who believes they have information regarding the shooting is urged to call the U.S. Park Police tip line at (415) 561-5150.

Watch: Duo Arrested After Hopping Over Fence at Zoo To Catch Pokemon