Father of stabbed Dodgers fan calls for witnesses - Article Photos 7/14

Robert Preece, left, and Robert Preece Jr., father and brother of Los Angeles Dodgers fan Jonathan Denver, embrace during a public plea for witnesses to Wednesday's fatal stabbing of Denver, during a news conference outside AT&T Park before the Giants' baseball game in San Francisco, Sunday, Sept. 29, 2013. (AP Photo/Tony Avelar)