Protester died of wounds sustained after he was "hit in the abdomen by a bullet fired by security forces," says Central Committee of Sudan Doctors, taking total death toll from military crackdown on demonstrations to 120.
At least 118 people have been killed while demanding a return to civilian rule, which is a condition set by Western governments to resume crucial aid, currently halted as a result of the military coup.
It was not immediately clear what started the fighting between members of rival ethnic Nuba and Misseriya people in the town of Lagawa.
Witnesses say they heard shooting and that houses had been burnt in Blue Nile state, where seven people were killed and over 20 suffered injuries.
Karim Khan is in Sudan a year after he visited the country for talks on outstanding arrest warrants over crimes committed during the 2003 Darfur war under ousted president Omar al Bashir.
Witnesses say security forces were trying to prevent swelling numbers of demonstrators from marching towards the presidential palace, the military's seat of power in the heart of the capital city.
Sudan’s leading pro-democracy groups had called for nationwide protest on Thursday to reiterate their demands for a reversal of the October 25 military coup.
The UN says it estimates around 50,000 people have been displaced by the latest fighting which has spilt over into neighbouring districts of West Darfur.
Ali Muhammad Ali Abd-Al-Rahman faces 31 counts of war crimes and crimes against humanity for his role in a conflict almost 20 years ago.
Security officers fired barrages of tear gas canisters on protesters demanding a restoration of the transition to civilian rule, witnesses say.
At least seven people were killed after security forces used gunfire and tear gas to disperse demonstrations against last year's military coup.
The United Nations has said it will hold talks in Sudan aimed at salvaging a fragile democratic transition amid a grinding stalemate following an October coup.
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