Shedrick Duffey, 22, of El Paso, Texas, was shot and killed on August 7, 2015, in the 2000 block of Pueblo Nuevo Circle while visiting the mother of his 2-year-old son. The shooting reportedly began after a dispute over parking that escalated into an exchange of gunfire. Witnesses said Duffey was unarmed; police initially said he had a weapon.

After the shooting officers took a father and son into custody for questioning; both were released the next day after claiming self-defense. The El Paso Police Department’s Crimes Against Persons Unit is investigating. Duffey’s mother, Raquel Murphy, has said she intends to press charges against the person she holds responsible, and family, friends, and community members have held vigils and memorials in his memory.

What information about the incident or the people involved might help the investigation move forward?