CAIRO—A Sudanese protester was shot dead during mass demonstrations against the recent military takeover and a subsequent deal that reinstated Prime Minister Abdalla Hamdok but sidelined the movement, a medical group said Monday. Tens of thousands of Sudanese took to the streets in the capital, Khartoum, and elsewhere in the country Sunday. The protests marked the third anniversary of the uprising that eventually forced the military removal of longtime autocrat Omar al-Bashir and his Islamic extremist movement in April 2019. Security forces fired tear gas to disperse demonstrators attempting to stage a sit-in near the presidential palace on the bank of the Blue Nile in the heart of Khartoum. There were also protests elsewhere in the country, such as the coastal city of Port Sudan, the eastern city of Kassala, and the northern city of Atbara, the birthplace of the uprising against al-Bashir. The Sudan Doctors Committee said a 28-year-old …