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Karen Read New No-Holds-Barred Doc Dives Into Retrial Prep ... Accused of Murdering Boston Cop BF

Karen Read is at the center of a new documentary series offering intimate access as she and her legal team gear up for her retrial in the death of her boyfriend, Boston police officer John O'Keefe -- and TMZ has your exclusive first look at Tuesday's upcoming episode.

In Investigation Discovery’s "A Body in the Snow: The Trial of Karen Read," Karen opens up her Mansfield, Massachusetts home to cameras and questions, insisting the allegations against her don’t add up.

John & Karen Read

Prosecutors allege in 2022, Read got into a heated drunken argument with O’Keefe before backing up and hitting him with her SUV, killing him ... then fleeing the scene, leaving him to die in a friend's snow-covered front yard.

Read has always insisted she's innocent, and her team claims she was framed -- saying John got into a fight with his fellow officers that night and they pinned his death on her.

Karen’s first trial ended in a mistrial last year ... the jury voted to acquit her on second-degree murder and fleeing the scene -- but deadlocked 9-3 in favor of convicting her on vehicular manslaughter.

The new docuseries dives into Karen’s upcoming April retrial, the investigation, her preparations, and the surrounding theories -- featuring key figures and an inside look at her mindset during 2024's trial. Read's facing charges of second-degree murder, motor vehicle manslaughter while driving under the influence, and leaving the scene of a collision causing death.

There’s a lot to unpack, so the five-episode ID docuseries, which kicked off tonight, is being rolled out over three nights, all available to stream on Max.