73-year-old Venerable Maduluwave Sobhitha died while undergoing treatment on Sunday.
Sobhitha led 'Movement for a Society with Justice' which became the rallying point for all anti-government forces. He became a vociferous critic of the then Rajapaksa rule while asking for far reaching democratic and constitutional reforms.
He played an significant role in getting the opposition political party approval to field Sirisena as the common opposition challenger to Rajapaksa in the presidential elections held in January this year.