( CNN ) -- Authorities in San Francisco are asking for help from anybody who witnessed a recent fatal stabbing of a Dodgers fan after a man once suspected in the case was released . The fatal slashing occurred Wednesday night and some have said it stemmed from the long-standing baseball rivalry between fans of the Los Angeles Dodgers and the San Francisco Giants . The incident occurred after the Dodgers and Giants played and a man wearing Dodgers gear was killed just blocks from the San Francisco stadium . The victim was Jonathan Denver , 24 , the son of a Dodgers security guard . A day after the stabbing , police arrested a 21-year-old man and said he faced a homicide charge . But Friday night that man was released from jail , CNN affiliate KGO reported . The San Francisco District Attorney 's Office released a statement about the case asking for witnesses to come forward . `` In California , it is the People 's burden to prove beyond a reasonable doubt that the defendant did not act in lawful self-defense , '' the statement said . `` We are also asking for the public 's help . If anyone witnessed the incident or has video , please contact the SFPD . '' The killing shocked many . `` The fact that anybody got into any sort of beef over the Giants and the Dodgers and somebody lost their life , '' San Francisco Police Chief Greg Suhr said earlier this week . `` It 's just senseless . '' In a prepared statement , the Giants called the incident `` horrific . '' The club held a moment of silence for Denver before a Thursday night game , and police bulked up security . A Dodgers statement said `` the pain that this has caused his family and friends is unimaginable . ''
The killing occurred Wednesday night near the San Francisco stadium . The victim was wearing Dodgers gear . A man who identified himself as a friend of the suspect told KGO-TV that he had been with him at Dodger Stadium when they were approached by two men in their 20s and 30s.