Federal prosecutors will seek the death penalty against a white supremacist who killed 10 Black people at a Buffalo supermarket, they said in a court filing Friday.

Payton Gendron, 20, is already serving a sentence of life in prison with no chance of parole after he pleaded guilty to state charges of murder and hate-motivated domestic terrorism in the 2022 attack.

New York does not have capital punishment, but the Justice Department had the option of seeking the death penalty in a separate federal hate crimes case. Gendron had promised to plead guilty in that case if prosecutors agreed not to seek the death penalty.

In a notice announcing the decision to seek the death penalty, Trini Ross, the U.S. attorney for western New York, wrote that Gendron had selected the supermarket “in order to maximize the number of Black victims.”

The notice cited a range of factors for the decision, including the substantial planning leading to the shooting and the decision to target at least one victim who was “particularly vulnerable due to old age and infirmity.”

Relatives of the victims had expressed mixed views on whether they thought federal prosecutors should pursue the death penalty.

“I’m not necessarily disappointed in the decision. … It would have satisfied me more knowing he would have spent the rest of his life in prison being surrounded by the population of people he tried to kill,” Mark Talley, whose 63-year-old mother Geraldine Talley was killed, said Friday.

“I would prefer he spend the rest of his life in prison suffering every day,” he added.

This is the first time Attorney General Merrick Garland has authorized a new pursuit of the death penalty. Under his leadership, the Justice Department has permitted the continuation of two capital prosecutions and withdrawn from pursuing death in more than two dozen cases.

There was no immediate comment from other victims’ families or prosecutors.

The Justice Department has made federal death penalty cases a rarity since the election of President Joe Biden, a Democrat who opposes capital punishment. Garland instituted a moratorium on federal executions in 2021 pending a review of procedures. Although the moratorium does not prevent prosecutors from seeking death sentences, the Justice Department has done so sparingly.

It successfully sought the death penalty for an antisemitic gunman who murdered 11 people at a Pittsburgh synagogue, which had been authorized as a death penalty case before Garland became attorney general. It also went ahead last year with an effort to get the death sentence against an Islamic extremist who killed eight people on a New York City bike path, though a lack of a unanimous jury meant that prosecution resulted in a life sentence.

The Justice Department has declined to pursue the death penalty in other mass killings. It passed on seeking the execution of a gunman who killed 23 people at a Walmart in El Paso, Texas.

On May 14, 2022, Gendron attacked shoppers and workers with a semi-automatic rifle at a Tops Friendly Market in Buffalo after driving more than 200 miles (320 kilometers) from his home in rural Conklin, New York.

He chose the business for its location in a predominantly Black neighborhood and livestreamed the massacre from a camera attached to his tactical helmet.

The victims, who ranged in age from 32 to 86, included eight customers, the store security guard and a church deacon who drove shoppers to and from the store with their groceries. Three people were wounded but survived.

The rifle Gendron fired was marked with racial slurs and phrases including “The Great Replacement,” a reference to a conspiracy theory that there’s a plot to diminish the influence of white people.