On September 5, 2011, in Crown Heights, Brooklyn, a dispute after the West Indian Day Parade ended with gunfire that killed 29-year-old Eusi Johnson. Surveillance video shows Johnson trying to flee as 34-year-old Leroy Webster shot him in the neck. Webster kept firing while police arrived and engaged him in a shootout.

Johnson died of the neck wound at the scene. Two officers were wounded by bullet fragments during the exchange, and a 56-year-old bystander, Denise Gay, who was sitting on her stoop, was struck and killed by a stray bullet. Webster was arrested and later convicted for Johnson’s murder and for assaulting the officers, and was sentenced to 40 years to life.

What details about that afternoon or the people involved might help shed more light on how the dispute escalated into such deadly violence?