FILE - This combination photo shows federal death row inmates Robert Bowers, from left, the gunman who massacred 11 worshippers at a Pittsburgh synagogue in 2018, Dylann Roof, who committed racist slayings of nine members of a Black South Carolina congregation, and Dzhokhar Tsarnaev, convicted for carrying out the April 15, 2013, Boston Marathon bombing attack. (Pennsylvania Department of Transportation, from left, Charleston County Sheriff's Office, FBI via AP, File)