Ian Johnstone holds a portrait of his father, David Johnstone, Wednesday afternoon, Jan. 28, 2014, near the site where the visiting book publisher was
Ian Johnstone holds a portrait of his father, David Johnstone, Wednesday afternoon, Jan. 28, 2014, near the site where the visiting book publisher was fatally shot 21 years ago in an attempted robbery on California Street in San Francisco, Calif. Johnstone, originally from New York, now lives in the city of his father's death and has created the website Gunbygun.com that raises crowd fund money for gun buybacks. (Karl Mondon/Bay Area News Group)