The death of Breonna Taylor, a Black medical worker who was shot and killed by Louisville police officers in March during a botched raid on her apartment, led to wide-scale demonstrations in the spring and summer as the case drew more attention.

A grand jury indicted a former Louisville police officer in late September for wanton endangerment for his actions during the raid. He pleaded not guilty. No charges were announced against the other two officers who fired shots, and no one was charged for causing Ms. Taylor’s death.

Audio recordings of roughly 15 hours from the grand jury proceedings were released on Oct. 2, in an extraordinarily unusual move that could shed light on what evidence the jurors considered.

Brett Hankison, a detective at the time, fired into the sliding glass patio door and window of Ms. Taylor’s apartment, both of which were covered with blinds, in violation of a department policy that requires officers to have a line of sight.

He is the only one of the three officers who was dismissed from the force, with a termination letter stating that he showed “an extreme indifference to the value of human life.”

Mayor Greg Fischer of Louisville, a Democrat, declared a state of emergency on Sept. 22 in anticipation of possible “civil unrest” and ordered a curfew from 9 p.m. to 6:30 a.m. for the next three nights. The city’s police chief, Robert J. Schroeder, also placed barricades and city vehicles downtown to restrict movement in the area and said he would not allow officers to request time off.