The antisemitic truck driver accused of gunning down 11 people at a Pittsburgh synagogue on Saturday has pleaded not guilty to federal charges that could put him on death row.

Robert Bowers, 46, was arraigned on Thursday, a day after a grand jury issued a 44-count indictment that charges him with murder, hate crimes, obstructing the practice of religion and other crimes. It was his second brief appearance in a federal courtroom since the weekend massacre at Tree of Life synagogue in Pittsburgh’s Squirrel Hill neighborhood. Authorities say Bowers raged against Jews during and after the deadliest antisemitic attack in American history.

Bowers, who was shot and wounded during a gun battle that injured four police officers, had been set for a preliminary hearing on the evidence, but federal prosecutors instead took the case to a grand jury.

The panel issued the indictment as funerals continued for the victims.

Jared Younger of Los Angeles told mourners that he waited for hours Saturday for his father to pick up his phone or let them know he was all right. The dread built all day until his sister learned their father, Irving Younger, had indeed been shot and killed.

“That waiting stage was just unbearable,” Jared Younger said at his father’s funeral on Wednesday. “Saturday was the most lonely day of my life.”

Funerals were planned Thursday for Bernice and Sylvan Simon, husband and wife, and Dr Richard Gottfried, a dentist who worked part-time at a clinic treating refugees and immigrants. The oldest victim, 97-year-old Rose Mallinger, will be honored at a service Friday. Her daughter was injured in the attack.

Friends recalled Irving Younger, 69, as a “kibbitzing, people-loving” man. He was one of the first people Rabbi Jeffrey Myers met when he came to town last year from New Jersey to lead Tree of Life.

Myers, who survived the massacre, is presiding over five funerals for seven congregants this week. He ran a few minutes late to Younger’s service because he was still at the burial for another victim, Joyce Fienberg.

“I can’t imagine the stress he’s under,” said his predecessor, Rabbi Chuck Diamond.

As Younger’s service was wrapping up, Myers momentarily forgot to read a letter to the family that another rabbi had sent.

“After preparing for five funerals, you get a little verklempt,” Myers said.

Bowers remained jailed without bail.