Nicholson was released on $2,500 bond.
The Loudoun County sheriff's office says Nicholson was with 24-year-old Sydney Maggiore when they got into an altercation with another man and woman.
A 2017 fourth-round pick out of Michigan State, Nicholson has played in all 14 of Washington's games so far and is 10th on the team with 41 tackles.
The Loudoun County Sheriff's Department arrived and arrested Nicholson after the attack on Tuesday, December 18. Other men tried to break up the fight, but Nicholson kept at it, throwing haymakers, including one that knocked the victim to the ground and left him looking limp.
Nicholson was arrested on Tuesday and charged with assault and battery and being drunk in public stemming from a fight at a restaurant and retail complex near the team's practice facility in Ashburn, Virginia.
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Nicholson is seen throwing multiple punches at a man outside a auto in a parking lot in Virginia. The Redskins have moved their safety to the reserve list, which will ultimately end of his season.
According to TMZ Sports, Redskins coach Jay Gruden said he has not yet spoken with Nicholson about the video, in which he can be seen knocking a man out in the street. CBS affiliate WUSA reports Maggiore is Nicholson's girlfriend. The victims were taken to the hospital for serious, but non-life-threatening injuries.
Of the incident involving Nicholson, Redskins senior vice president of communications Tony Wyllie said in a statement: "We are aware of the arrest of Montae Nicholson".
Then there's linebacker Mason Foster, who used a profanity-filled Instagram post aimed at both the Redskins organization and its fans.
He has not played in the last four games and has all but played his last game in a Redskins uniform.