Preston Hemphill, who had been in the southern US city's police force since 2018, "violated multiple departmental policies," including on "personal conduct," "truthfulness" and regulations on Taser gun use, the department said in a statement.
Five other officers had already been fired and charged with murder over Nichols's death.
UAE President, Iraqi PM discuss bilateral relations over phone
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Hemphill, a white man, had been suspended since the beginning of the department's investigation, but that was not made public until Monday.
Nichols was arrested by members of a special police unit called Scorpion on January 7 for what police said was a traffic violation.
Footage of his vicious beating, recorded on body cameras and security cameras, triggered national outrage when it was made public last week.
Police video showed Hemphill at the initial traffic stop when officers attempted to detain Nichols, but he was not among the officers who chased Nichols down and beat him.
A funeral for Nichols was held on Wednesday, with Vice President Kamala Harris in attendance.
The crash began with a reported stabbing in Dayton, police said, and a pickup truck accident in the Dayton suburb of Riverside at about 7:30 p.m. Apparently, the suspect in the reported stabbing fled that scene and then crashed the pickup, police said.
If there was ever a moment when it seemed certain that the old American way of policing was dead, it came in early June with the drone footage of a river of tens of thousands of Black Lives Matter protesters
George Floyd's death sparked nationwide protests demanding a reckoning with institutional racism that have sometimes resulted in clashes with police, but many officers took a less aggressive stance over the weekend when demonstrations were overwhelmingly peaceful.
The resignations were confirmed by the police union and two law enforcement officials that spoke to ‘The Buffalo News.’ Two members of the tactical unit, which responds to riots and crowd control, were suspended without pay on Thursday after video emerged of the confrontation during the emergency curfew.
His Highness Sheikh Saud Bin Saqr Al Qasimi, Member of the Supreme Council and Ruler of Ras Al Khaimah visited the Sharjah Research, Technology and Innovation Park (SRTIP) on Monday, where he was given a comprehensive briefing on the services and solutions offered to local and international companies and projects within and outside the UAE.
Conservative media tycoon Rupert Murdoch will tie the knot for the fifth time, at the age of 92 years, he said on Monday in an interview with his own newspaper, the New York Post.
The company said in a statement that it had declared "a state of emergency following an oil spill in the west of the country," noting that "there were no injuries resulting from the leak and that production operations were not affected."
Chinese President Xi Jinping met his "dear friend" Vladimir Putin in Moscow on Monday, seeking both to deepen economic ties with an ally he sees as a useful counterweight to the West and to promote Beijing's role as a potential peacemaker in Ukraine.