Man playing Pokemon GO shot to death in San Francisco

A 20-year-old man was shot to death while playing "Pokemon Go" at a tourist attraction along San Francisco's waterfront, authorities and a family friend said.An unknown assailant shot Calvin Riley on Saturday night at Aquatic Park near Ghiradelli Square, the U.S. Park Police said Sunday. A family friend called it a random attack.Riley was playing the hit mobile game with a friend when someone shot him from behind and took off, John Kirby told KGO-TV."From what we know, there was no confrontation