The white supremacist who plowed his car into counter-protesters opposing a white nationalist rally in Virginia two years ago, killing one and injuring dozens, has asked a judge for mercy and a sentence shorter than life in prison.

Lawyers for James Alex Fields, 22, said in a sentencing memo submitted in court documents on Friday Field should not spend his entire life in prison because of his age, a traumatic childhood and a history of mental illness.

Fields pleaded guilty to federal hate crimes in March and is set to be sentenced on 28 June.

“No amount of punishment imposed on James can repair the damage he caused to dozens of innocent people. But this court should find that retribution has limits,” his attorneys wrote.

Prosecutors countered that the avowed antisemite and admirer of Adolf Hitler has shown no remorse since he drove the car into the a crowd on 12 August 2017, killing antiracism activist Heather Heyer and injuring others.

The attorneys for Fields said that giving him something less than a life sentence would be akin to an “expression of mercy” and a “conviction that no individual is wholly defined by their worst moments”.

Prosecutors said Fields deserves a life sentence, adding that would help deter others from committing “similar acts of domestic terrorism”.

Fields’ case stirred racial tensions around the US. He pleaded in March to federal hate crime charges and admitted that he intentionally plowed his speeding car into a crowd of antiracism protesters.

Under a plea deal, federal prosecutors agreed not to pursue the death penalty. The charges he pleaded guilty to call for life in prison under federal sentencing guidelines.

Fields was convicted in December in a Virginia court of first-degree murder and other state charges. Sentencing on the state charges is scheduled for next month.

The rally in 2017 drew hundreds of white nationalists to Charlottesville to protest the planned removal of a statue of Confederate general Robert E Lee. Hundreds demonstrated against the white nationalists.

In Friday’s memo, Fields’ attorneys highlighted his difficult upbringing and history of mental illness, but many of the details were redacted. He was raised by a paraplegic single mother and suffered “trauma” by growing up knowing his Jewish grandfather had murdered his grandmother before killing himself, his lawyers said.

Prosecutors focused on years of documented racist and antisemitic behavior by Fields, which they said included keeping a picture of Hitler on his bedside table. They also said in court documents he was recorded on a jail phone call making disparaging remarks about Heyer’s mother as recently as last month.

Prosecutors also said that while Fields has a history of mental illness issues, it doesn’t excuse his behavior in a way that would require a lenient sentence.

“Any mental health concerns raised by the defendant do not overcome the defendant’s demonstrated lack of remorse and his prior history of substantial racial animus,” they wrote.