PUNTA GORDA, Fla. Several police missteps led to the shooting death of a retired librarian, investigators said. But city-commissioned report, conducted by former police chief Arnold Gibbs, concluded the department has made the necessary changes in the wake of the shooting that killed Mary Knowlton, 73, during a citizens police academy training last August. “Whatever shortcomings or gaps there might have been, they believe those issues have been addressed,” City of Punta Gorda Spokeswoman Sandi Poreda said. Former Officer Lee Coel was charged with first-degree manslaughter for his alleged role as the trigger man and later fired from the department. Police Chief Tom Lewis was charged with culpable negligence, a second-degree misdemeanor, and placed on paid administrative leave. Gibbs’ review found the Punta Gorda Police Department should have had a designated safety officer to check all the guns and ammunition that would be used in the demonstration. The department has since created a “scenario-based training” policy that will require a safety officer to be present. Poor judgment by command-level officers and a lack of department policy also contributed to the shooting, according to the Gibbs report. Lewis implemented changes shortly after the shooting, including a reorganization of the department’s armory so that live and non-deadly ammunition would be kept separately. The city is waiting for the criminal negligence case against Lewis to be resolved before it begins an internal affairs investigation.