Karen Read attorney Alan Jackson is back on the warpath in his quest to “pull back the curtain” on policing in Massachusetts, and this time Boston’s top cop is in the hot seat.

“Boston Police Commissioner Michael Cox has been caught in a lie — and not a small one,” Jackson wrote in a blistering letter to Mayor Michelle Wu Monday, calling for a disciplinary review over Cox’s remarks about a former officer who testified during Read’s second trial.

Jackson’s letter focuses on comments Cox made to reporters on July 10, when he denied pressuring then-Boston Police Officer Kelly Dever into changing her testimony and claimed he didn’t even know Dever was associated with Read’s case.

“I have nothing to do with Karen Read,” Cox said at the time.

Read, 45, was accused of backing her SUV in

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