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Louisville PD

Breonna Taylor's boyfriend Kenneth Walker implicated her as the shooter when three Louisville cops burst into her apartment to serve a no-knock drug warrant in March.

Police were there serving a no-knock warrant stemming from taped jailhouse conversations between Taylor and her ex-boyfriend, Jamarcus Glover, who was the target of a narcotics investigation.

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Louisville PD

In one audio of a jailhouse call, Glover tells someone he and Taylor hadn't seen each other in two months.

Walker's words were captured on a police body camera after Taylor was killed in a hail of bullets.

About a minute into the video clip, when an officer asks which one of them fired at cops, Walker says, "It was her. She was scared."

But civil rights attorney Lee Merritt claims Walker misspoke, and that the tape will prove beneficial in a potential federal case against the cops who killed Taylor.

Merritt joined TMZ on "TMZ Live" Thursday to discuss what Walker said to Louisville cops on the scene in the chaotic moments after the deadly raid.

The video footage is part of a cache of documents released by Louisville police on Thursday. The material includes 250 videos, more than 4,000 pages of documents, and photographs that show Taylor and Walker holding an assortment of guns.

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Louisville PD

One social media photo that shows Taylor and Walker holding guns is tagged "Partners in Crime."

In one video, Walker repeatedly tells cops he and Taylor didn't know that the invaders breaking into their apartment was police.

Merritt says Walker's words may create some doubt as to who fired the shot that hit Louisville PD officer Jonathan Mattingly in the thigh -- severing an artery.

But he adds the video also shows Walker was very emotional and under intense duress.

Since the night of the raid, Merritt says Walker has insisted he's the one who fired his legally - owned 9mm handgun.

Although the grand jury did not indict any of the officers for killing Taylor ... Merritt says they're still pushing for federal charges against all three cops.