Efren Madrigal was 23 when he was fatally shot in Chicago on December 31, 2011. He was found with multiple gunshot wounds on a residential street in the Gage Park neighborhood on the Southwest Side and died shortly after emergency responders arrived.

Authorities provided little information about suspects or a motive, and investigators faced the kinds of challenges often encountered in violent Chicago neighborhoods. Madrigal’s death was one of more than 400 homicides in the city that year, a grim total that disproportionately affected areas like Gage Park already dealing with gang activity, poverty, and systemic neglect.

Did anyone in Gage Park around New Year’s Eve 2011 see or hear anything that could help shed light on what happened to Efren Madrigal?