Nathan Cabadas was 18 when he was shot and killed in a Glendale, Arizona parking lot just before 11 p.m. on December 23, 2015. Officers responding to reports of a shooting at a shopping center near 51st and Northern avenues found him with at least one gunshot wound; paramedics pronounced him dead at the scene.

Police say the shooting grew out of a dispute: Nathan was reportedly in an altercation with one person when a second individual produced a firearm and shot him. Two suspects, described as African-American men, fled southbound in a light-colored four-door sedan, possibly a Honda. No arrests had been made and investigators appealed for tips.

What details about that night or the people involved might help piece together what led to Nathan’s death?