A jury found a D.C. man guilty of aggravated assault in connection with his role in a 2013 attack of two men near the U Street Metro station, authorities said.

The man, Frank G. Smith, 34, was convicted Wednesday after a trial in D.C. Superior Court.

Authorities said that in the early hours of Dec. 21, 2013, Smith, 34, and his friends attacked a man. Smith and his friends kicked the man, who had a traffic dispute with one of Smith’s friends, while the man was on the ground outside the entrance of the U Street station, according to a news release from the U.S. Attorney’s Office for the District of Columbia.

A witness yelled at Smith and his friends and tried to stop them from beating the man, authorities said. One of Smith’s friends then began fighting with the witness, and investigators said the witness noticed that he was cut and bleeding across his chest.

Smith then attacked the witness, authorities said, and at some point the witness saw that his left hand had been cut to the bone between the index finger and thumb.

When police arrived, Smith stopped attacking the witness and tried to walk away, but was later stopped by officers. No knife or sharp object was recovered from Smith, who had blood on his face and clothes, according to the news release. A DNA analysis tied blood found on Smith’s clothes to the witness, investigators said.

His sentencing is scheduled for April 22.