ATLANTA — An autopsy determined Bobbi Kristina Brown had a mix of drugs in her body when she went underwater in a bathtub, but a medical examiner couldn’t tell whether her death was a homicide, making the criminal investigation tougher.

The medical examiner’s report released Friday showed that Brown had morphine, cocaine, alcohol and prescription drugs in her body and came after months of speculation about how she died.

The medical examiner’s office said it couldn’t figure out if it was a suicide, a homicide or accidental so it classified the manner of death as “undetermined.”

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