Sgt. Hugh Barry has pleaded not guilty in last year's death of Deborah Danner, who was brandishing a bat when the eight year veteran shot her.
Danner had been diagnosed with schizophrenia and officers had been called to her home several times before. Her shooting sparked protests and a rebuke from the mayor.
Prosecutors on Tuesday said Barry did not use his police training. They said he failed to listen to Danner and "failed to grasp the actions of a mentally ill woman."
The defense attorney says Barry made a split-second decision to protect himself when the woman grabbed the bat.
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