Det. Sgt. Tommy Smith, 42, was fatally shot by Det. Michael Maes as they and other officers conducted a probation search at a Dublin apartment with an unusual layout. Maes, the report said, mistook Smith for a potential assailant.
According to the report, the officers had spread out in the apartment when Smith emerged from a darkened closet into the bedroom, his weapon raised.
The suspect was in custody on robbery charges, but officers who went to search his apartment found the door unlocked, believed someone may have been home, and entered with guns drawn.
The incident marked the first death in the line of duty in the history of the BART police force.
Rainey noted that after the shooting, he "immediately put into place the requirement that no residential probation or parole searches can be conducted without the approval of a deputy chief. In addition, all sergeants and officers were retrained in the use and activation of the Axon – Flex body camera system."
He said he was also sending officers to a class on warrants and high-risk operations.