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Brian Walshe -- the man accused of brutally murdering and dismembering his wife in Massachusetts -- has changed his plea from not guilty to guilty on 2 charges, TMZ has learned.

Released video of the trial shows Walshe has pleaded guilty to misleading a police investigation and unlawfully conveying a body. He's pleaded not guilty to a first-degree murder charge. Jury selection in the murder trial was set to begin today.

If you don't remember the details of this case, it's gruesome ... The Norfolk District Attorney alleges Walshe killed his wife 39-year-old Ana early on New Year's Day 2023 and chopped up her body before disposing of it. Police recovered a bloody knife from the basement of their home, but her body has never been found.

The iPad of the couple's oldest child s

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