6 Louisville police officers are under internal investigation for their roles in fatal Breonna Taylor shooting

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LOUISVILLE, Ky. — Six Louisville Metro Police officers are under investigation by the department's Professional Standards Unit for their roles in the fatal shooting of Breonna Taylor, the department confirmed Monday.

That unit, which investigates whether officers broke department policies, has initiated its probe into the case, department spokeswoman Jessie Halladay said. 

LMPD did not say which potential policy violations it is investigating. The investigation could lead to disciplinary action against the officers ranging from a written reprimand to termination.

The review is separate from the investigation conducted by LMPD's Public Integrity Unit, which forwarded its findings to Kentucky Attorney General Daniel Cameron to determine whether criminal charges should be filed against any of the officers.

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Cameron hasn't said when that decision will be made.

The LMPD officers under investigation by the Professional Standards Unit include Detective Myles Cosgrove and Sgt. Jonathan Mattingly, who fired their weapons at Taylor's apartment, along with Detective Joshua Jaynes, who swore out the affidavit to get the search warrant for Taylor's apartment and four other homes that night. 

It also includes detectives Tony James, Michael Campbell and Michael Nobles.

All the officers under internal investigation except Jaynes were at Taylor's apartment when the search warrant was initiated around 12:40 a.m. on March 13, according to a police interview with Mattingly that's been made public.

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Additionally, Mattingly identified one officer apparently not under investigation: Lt. Shawn Hoover.

Campbell, who had been tasked with surveilling Taylor's apartment before the raid, is a member of the Place-Based Investigations Squad that conducted the probe that led police to Taylor's apartment.

Nobles and James were members of the Interdiction Squad, according to a log provided by LMPD that showed officers' sworn assignments on March 13.

The officers at Taylor's apartment said they knocked on her door and announced their presence. Taylor's boyfriend, Kenneth Walker, however, says he and Taylor didn't know who was knocking at the door. 

When police broke down the front door of the apartment, Walker fired one shot from his firearm, which police say struck Mattingly in the thigh, severing his femoral artery.

Three officers — Mattingly, Cosgrove and then-Detective Brett Hankison — returned fire, striking Taylor five times.

She died in her hallway.

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State law governing investigations into police officers' violation of departmental rules says "no public statements shall be made concerning the alleged violation by any person or persons of the consolidated local government or the police officer so charged, until final disposition of the charges."

It also adds a police officer cannot be compelled to speak or testify "by any person or body of a nongovernmental nature" as a condition of employment.

Hankison, who was fired in June for "blindly" firing his weapon into the apartment, was fired based on the Public Integrity Unit investigation. 

The department has refused to release that investigative file.

A white board police used to plan the search warrant operation March 13, shared by Jefferson Commonwealth's Attorney Tom Wine in a May news conference, showed that Taylor's apartment was to be staffed by eight officers, plus a police dog. 

In addition to Mattingly, Campbell, James, Cosgrove and Hankison, it included a "Knobles," a possible reference to Nobles.

Jaynes, the only officer under PSU investigation who was not present at Taylor's apartment, was at 2424 Elliott Ave. where a related search warrant was used around the same time as Taylor's. His name is listed on the seized property log and next to several items recovered that night.

Taylor's ex-boyfriend Jamarcus Glover lived at 2424 Elliott Ave., and officers said they saw him picking up a package at her home then driving to a "known drug house." He also listed his address as hers, and officers saw her car at Elliott Avenue.

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Police suspected Taylor was receiving drugs and drug money on Glover's behalf, but no drugs or cash were found at her apartment, and attorneys for her family have questioned the reliability of the information. 

Follow Darcy Costello on Twitter: @dctello.