DC Young Fly‘s partner Jacky Oh! died from cosmetic surgery complications, but the doctor who operated on her won’t be charged with any crimes … TMZ has learned.

The Miami Police Department tells TMZ … the medical examiner ruled Jacky’s death accidental, and homicide detectives will not launch a criminal investigation.

As we reported … Jacky flew to Miami back in May for cosmetic procedures, and she was prescribed medications after the procedure. Jacky then got a headache, went back to the surgeon for a post-operative appointment, decided to get a massage to alleviate her pain and was advised to swap some of the pills she was taking.

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According to the ME report, Jacky then began to feel her head “burning” and she had difficulty speaking. A family member called 911 but Jacky was unresponsive before first responders arrived, and she was ultimately pronounced dead at a hospital.

The autopsy report noted Jacky had swelling in her brain and extensive bleeding of the skin around her torso.

In a since-deleted social media post before her death, Jacky said she was in Miami for a “mommy makeover” with Dr. Zachary Okhah.

Dr. Okhah released a statement shortly after Jacky’s death, though he didn’t directly address the situation … instead saying his office “remains devoted to the highest quality medical care.”

The doc added … “All aesthetic procedures are performed in a hygienically safe environment to universally recognized medical standards.”

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There was some question as to whether anyone would be charged in Jacky’s death … but on the heels of the Medical Examiner’s findings, cops say that won’t happen.