BUFFALO, N.Y. — The 19-year-old white gunman who killed 10 Black people at a Buffalo grocery last year had to be removed from court by guards Wednesday after a man charged toward him during emotional statements from victims’ families.

The dramatic moment came as the sister of victim Katherine Massey addressed the shooter, Payton Gendron, ahead of his sentencing for the May 14 racist massacre at Tops Friendly Markets.

“You killed my sister. I will hurt you so bad. I’m not gonna be nice. Kat was my sister. I want to personally choke you out,” Barbara Massey told the gunman.

“You don’t know a damn thing about Black people. We’re human. We like our kids to go to good schools. We love our kids. We never go to no neighborhoods to take people out,” she added.

As Barbara Massey continued to address the shooter, a man in a gray jogging suit ran toward Gendron, who was rushed out of the courtroom. Authorities surrounded the unidentified man, leading to a short break.

Erie County Judge Susan Egan addressed the tense moment after everyone returned to the courtroom.

“I am sure that you are all disturbed by the physicality that we’ve seen in the courtroom here today. I understand that emotion. And I understand that anger. But we cannot have that in the courtroom,” she said.

“We must conduct ourselves appropriately because we are all better than that,” Egan added.

Victim statements then resumed.

Authorities said that Gendron was dressed in tactical gear when he unleashed a flurry of bullets in the parking lot of Tops. He streamed the attack on the social media platform Twitch before it was taken down.

He fatally shot three people and wounded one in the parking lot before entering the store, where he was confronted by Tops security guard Aaron Salter. Officials said Salter’s rounds didn’t appear to penetrate Gendron’s ballistic gear, and the gunman shot and killed the security guard before shooting others.

A document Gendron posted online claimed he had been radicalized and appeared to adhere to the false replacement theory, which has been used by white killers to justify violence against Muslims, Latinos and Jewish people around the world.

Buffalo Mayor Byron Brown said that Gendron lived hours away and drove to Buffalo to carry out the crime. The document stated that he chose Buffalo because it was the city with the most Black residents closest to his home. Thirteen people, including 11 Black people and two white people, were shot during the massacre.

Gendron also faces 27 federal counts including murder, discharging a firearm and hate crimes. If convicted, he faces a maximum sentence of life in prison or the death penalty. The attorney general will decide whether to seek the death penalty, the Justice Department said in a news release. He pleaded not guilty in July.

Tops Friendly Markets reopened in July after undergoing extensive renovations.

Marcus Morris, 27, of east Buffalo, said he had to pray before he got out of his vehicle and walked into the store Tuesday for the first time. His uncle, Margus Morrison, was among the 10 killed.

“Your chest definitely gets a little heavy just pulling in. I sat in the car and said a little prayer before I got out for all the victims, especially my uncle,” Morris said.

“You can’t not think about it when going in there,” he added.

This is a developing story. Please check back for updates.