CHARLOTTESVILLE, Va. — The man suspected of ramming his car into a crowd here, an attack that the authorities said left one person dead and 19 more injured, was denied bail during his first court appearance in a downtown courtroom on Monday.

“You are charged with a number of felonies, including murder and malicious wounding,” Judge Robert Downer told the man, James Alex Fields Jr., who was not in the courtroom but was seen on a small video screen sitting with his shoulders slumped in front of a dark cinder block wall and a filing cabinet.

A statement by city officials said Mr. Fields, 20, was the driver of the Dodge Challenger that on Saturday drove into a group of counterprotesters, after a planned rally of white nationalists in a city park spun out of control, resulting in melees in the streets. On Monday, outside the building, a man identified as a white nationalist by the Southern Poverty Law Center and another apparent supporter of the cause stood amid a knot of television cameras and vowed to return to the city.

Judge Downer said he would not grant bond to Mr. Fields, at least until he met with a court-appointed lawyer, Charles Weber. Mr. Fields answered Judge Downer’s questions simply, saying, “Yes, sir” and “No, sir.” Mr. Fields told the judge he worked at Securitas, a national firm that employs more than 88,000 security officers. A financial disclosure form shown to the court said he made $650 every two weeks.