WASHINGTON (WUSA9) -- A Maryland man who was allegedly caught on video attacking two people while riding Metro has admitted to the crime.

According to the U.S. Attorney's Office, William Nelson of Morningside, Md. pleaded guilty Thursday to felony assault and misdemeanor assault in connection to the June 7 incident.

Prosecutors say Nelson, 52, riding on the Green Line towards the Anacostia Station when two juveniles seated behind him put their feet up on the window area between their seat and Nelson's. Nelson, who appeared to be asleep at the time, woke up and got into a verbal argument with the two teens.

The two juveniles moved away from Nelson, but he continued to follow them and eventually punched one of them in the face, according to prosecutors.

Meanwhile, a 46-year-old man approached Nelson and confronted him about his behavior. Nelson then punched the man multiple times, causing him to bleed from the face.

A video of Nelson repeatedly punching the man was uploaded to Facebook, where it was widely distributed.

Nelson is scheduled to be sentenced on September 8, where he faces more than three years in prison.

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