Frederick Douglas Wilburn, 34, died after an officer-involved shooting in Tucson on the evening of December 7, 2017. The Arizona Department of Public Safety says detectives from its Criminal Investigations Division were conducting a traffic stop near Speedway and Beverly when Wilburn allegedly drove his vehicle toward the detectives and a detective fired, striking him. DPS has said the detective fired out of fear for his life and assigned its Phoenix unit to handle the administrative and criminal review.

Wilburn’s family say he had no criminal history, had lived in Tucson for more than three years, had recently proposed to his fiancée and was the father of two very young sons, ages two years and four months at the time. The family reports feeling stonewalled by investigators and wants a full, transparent accounting of what happened.

Are there witnesses, dash- or body-camera video, or other evidence from that intersection on December 7 that could clarify the sequence of events?