Fields on Monday made his first court appearance and his next hearing was set for August 25.
White supremacist groups were protesting the removal of a statue from Confederate Gen. Robert E. Lee, which sparked the violent clashes. Heyer and other protesters were there to show their opposition to the racism.
Democrats criticized the president for failing to single out white nationalists, and several Republicans issued statements condemning white nationalism or white supremacists.
Bloom told the Toledo Blade newspaper that her son had said he was going to an "alt-right" rally in Virginia - using a term that encompasses the Ku Klux Klan, neo-Nazis and white nationalists. Another 19 people were injured and Fields was charged with second-degree murder as well as three counts of malicious wounding, and a lone count of hit-and-run.More news: Army launches strike forces against Boko Haram in north east
An Ohio man accused of ramming his auto into a crowd of protesters at a white nationalist rally in Virginia will remain in jail - at least until he has an attorney.
Department of Justice officials opened a civil rights investigation Saturday into the deadly vehicle attack, the U.S. Attorney's Office for the Western District of Virginia and the Richmond field office of the FBI said.
Police have not yet provided a motive for the incident, but the authorities have opened a civil rights investigation into the crash, a Federal Bureau of Investigation field office said.
The group on Sunday denied any association with Fields.More news: Perseid Meteor Shower viewing at Brandy Creek Beach
As they waved Confederate flags and screamed racist, homophobic and anti-Semitic slurs, the protesters - nearly all white and male - were met with fierce resistance from activists who had come to stop them.
On Saturday morning, the 20-year-old was photographed standing shoulder-to-shoulder with the far right hate group Vanguard America.More news: Donald Trump Takes Another Shot at Mitch McConnell for Obamacare Failure