Christopher Johnson was 20 when he was killed in a quadruple shooting in St. Louis on Christmas Eve, 2014. Police responded to reports of gunfire and discovered multiple victims; Johnson was among those who died in the violent confrontation that night.

Investigators treated the incident as a homicide and worked through the night and in the days after to reconstruct what happened. Authorities later identified two men they believed were responsible, and prosecutors pursued the case as part of a broader effort to hold those involved accountable.

What information do readers in St. Louis have about the scene or the people involved that could help clarify what happened that night?