Louisville Sergeant Jonathan Mattingly said that boyfriend Kenneth Walker, 26, fired a shot that hit Mattingly in the leg after officers had entered the home on a 'no-knock' search warrant as part of a drugs investigation.
Mattingly, a 20-year veteran of the force, was the only officer wounded in the incident, and Taylor's boyfriend claimed he thought the officers were burglars.
Officers then returned fire, shooting into the apartment 32 times and killing 26-year-old Breonna in a hail of bullets.
Taylor was shot multiple times on the night of her death on March 13 and died in her hallway. She had no criminal record and no drugs were found at the property.
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The lawsuit states the incident caused Mattingly 'severe trauma, mental anguish, and emotional distress'.
'Walker's conduct in shooting Mattingly is outrageous, intolerable, and offends all accepted standards of decency and morality,' it reads, according to CBS News. The police officer has previously said that Taylor's case is a tragedy but maintains he was doing his job.
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In an interview with ABC News and The Louisville Courier Journal, Mr Mattingly accused city officials of not coming to his defence in the aftermath of the shooting.
"It's been excruciating," he said. "When you have the truth right there in your hands and everything else is getting crammed around you, it's frustrating."
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'This is a point where we were doing our job, we gave too much time when we go in, I get shot, we returned fire,' Mattingly said .
'This is not us going, hunting somebody down. This is not kneeling on a neck. It's nothing like that,' referring to George Floyd’s death.
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In response to the lawsuit, Walker's lawyer stated his client was 'immune from both criminal prosecution and civil liability as he was acting in self defense in his own home.'
Walker himself has filed suit against several Louisville police officers.
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Mattingly, Detective Myles Cosgrove and former Detective Brett Hankison, were in plainclothes when they forced entry into Taylor’s apartment to conduct a 'no knock' warrant in an attempted drug raid shortly before 1am.
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They started shooting after Taylor’s boyfriend Kenneth Walker fired what he called a 'warning shot' when police broke down the door.
He fired in self defense after the cops failed to announce themselves.
On 23 September, a grand jury charged one officer, Brett Hankison - not with Ms Taylor's death but with three counts wanton endangerment for firing into a neighbour's apartment with people inside. He pleaded not guilty five days later.
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Mattingly and Det. Myles Cosgrove however, is still with the police department and has been placed on administrative reassignment.
Outrage continues to simmer across the country as no officers have been charged in Taylor’s death despite national protests and demands for charges.
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