New details in the Marcell Ozuna domestic violence arrest -- cops say his wife claimed the MLB star threatened to kill her during a heated dispute "over an infidelity."

It's all in the booking report obtained by TMZ Sports ... in which Sandy Springs Police Officers describe what happened when they arrived to the Atlanta Braves star's Georgia home on May 29.

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Two officers say they responded to a report of a domestic dispute -- and the alleged victim told them 30-year-old Ozuna had "took both her cell phones from the bathroom while she showered without her consent."

When she demanded Ozuna return the phones, Marcell allegedly refused -- and then "He threatened to kill her and she threatened to call 911," according to the report.