Atlanta • An autopsy will be needed to evaluate what led to the death of Bobbi Kristina Brown, daughter of singer Whitney Houston, authorities said Monday, the day after her death.

In a statement Monday morning, the Fulton County Medical Examiner’s Office says the time that elapsed from when she was found unresponsive in January until her death Sunday will “complicate” its effort to reconstruct events.

“Interpretation of autopsy findings and other information will also be challenging,” the medical examiner’s office said in the statement. “However, an autopsy could be helpful to address questions which may arise about the cause of her unresponsiveness and eventual death.”