South Korean investigators are set to release results on Monday of a wide-ranging 90-day probe into the country's political scandal. 

The Constitutional Court completed its hearings last Monday, with a final ruling on President Park Geun-hye's impeachment expected later this month. 

The embattled leader is currently holed up in the presidential palace with her powers suspended. She was impeached last December for allegedly allowing confidante Choi Soon-sil to meddle in state affairs.

The impeachment motion against Park needs approval from at least six judges to take effect, after which a presidential election will be held within 60 days.