Derrick Whitfield, 23, was shot and killed in the early hours of May 23, 2014, at a public housing project in San Francisco’s Potrero Hill neighborhood. He was pronounced dead at the scene.

The San Francisco Police Department investigated the fatal shooting and eventually arrested a suspect who was charged with murder and related offenses; the case moved forward through the courts with prosecution and defense activity. Whitfield’s family and friends attended hearings and held vigils as they sought justice and remembered him.

What details about that night or the neighborhood might help explain what happened or point to anyone with information?