Robert Bowers, who authorities say killed 11 people at the Tree of Life Synagogue in Pittsburgh last weekend, pleaded not guilty Thursday at his federal arraignment. The 46-year-old appeared in court in a red prison jumpsuit and requested a jury trial, according to reports. On Wednesday, a federal grand jury indicted Bowers on 44 counts, including hate crimes. He potentially faces the death penalty if convicted. Bowers is accused of gunning down 11 people at the Pittsburgh synagogue on Saturday, shouting “All Jews must die!” as he stormed the house of worship.