The Hospital Authority confirmed that Chow Tsz-lok, 22, an undergraduate student at the Hong Kong University of Science and Technology, had died of injuries.
Prosecutors say five of the 20 deaths recorded in the protests were suspected to have been at the hands of security forces.
Renewed protests began on Thursday evening in a month of deadly unrest that has claimed more than 200 lives.
Carrie Lam said a ban on face masks would take effect on Saturday under the emergency laws that allow authorities to "make any regulations whatsoever" in whatever they deem to be in the public interest.
Several hundred protesters converged at a subway station in the Tung Chung area adjacent to the airport amid widespread anger over alleged brutality against demonstrators during three months of protests in Hong Kong.
Police and protesters clash as yet another day of protest marches in Hong Kong turned into a confrontation between police and activists.
Chanting "Sudan is rising, the army is rising," crowds of men and women massed outside the complex that also houses Bashir's official residence and the defence ministry, many of them having spent the night there.
Angry protesters rally after the government raises the price of a loaf of bread from one Sudanese pound to three. At least 19 people have been killed since the initial days of demonstrations that erupted on December 19.
A rally turned into a violent protest in Paris where police fired tear gas to disperse hundreds of people, protesting against government's economic policies.
Police have released new images and video of the suspect and say they are close to identifying him.
Unrest erupts at detention centre on Greek island of Lesbos as police clash with refugees
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