Gabriella Arellano was 17 when she was found dead in a narrow East Side alley off the 11000 block of South Mackinaw Avenue in Chicago. First responders pronounced her dead at the scene around 10 a.m. after she suffered two gunshot wounds to the head; the Cook County Medical Examiner’s Office later confirmed her identity. The alley, framed by garages and back fences, became an impromptu place of mourning as news spread through the neighborhood.

Detectives with the Chicago Police Department’s Area Two opened a homicide investigation and canvassed the area for evidence, but authorities did not immediately say what led up to the shooting. By the end of the day no one had been taken into custody, and police released no details about any suspect or suspects. If anyone in the neighborhood saw or heard anything about Gabriella Arellano on October 26, when she was found, please come forward with information.