Stephen Martin, 30, was fatally assaulted in Golden Gate Park’s Sharon Meadows after the Bay to Breakers race on May 20, 2012. Martin had attended the event in a troll costume with friends and became involved in an altercation with a group of about 12 people. During the confrontation a man from that group punched Martin, who fell and struck his head on the pavement. He was hospitalized in a coma and died on June 8, 2012, after his family removed life support.

Witnesses described one suspect as a Latino male in his 20s wearing a white 49ers jersey; police released photos of two people they believe were involved and said the dispute reportedly began over a cellphone. No arrests have been announced and the San Francisco Police Department is still seeking tips and witnesses.

If anyone was at Sharon Meadows after Bay to Breakers or has information about the groups involved, can you share what you saw or heard?