Aldo Troncoso, 24, known to friends as Trigger, was fatally shot in San Francisco’s Mission District in the early morning of February 26, 2011. Police found him with gunshot wounds near 17th and Mission Streets around 2:25 a.m.; he was taken to a hospital and died at about 4:00 a.m. A black SUV-type vehicle was seen leaving the scene. Investigators noted the shooting occurred amid rising violence between Norteño and Sureño groups, and the department’s gang task force assisted homicide detectives, though early reporting did not definitively establish whether Troncoso was gang-affiliated.

Friends and loved ones created a memorial at the corner where he was shot; it was later vandalized, and a string of related incidents followed, including a March 2 shooting that wounded a 26-year-old and may have been retaliation. Authorities increased patrols, deployed undercover and gang investigators, and coordinated security for Troncoso’s visitation on March 4 and funeral Mass on March 5 because those services were in Norteño-associated territory. Troncoso is survived by his parents, siblings, nieces, nephews and his girlfriend. No arrests were publicly identified in the aftermath of his death.

Does anyone who knew Aldo or was in the Mission District that night have information that could help clarify what happened?