Robert Bowers, the man prosecutors say carried out the mass shooting at Pittsburgh's Tree of Life synagogue that left 11 people dead in October, pleaded not guilty to 19 new charges on Monday. Bowers in November had already pleaded not guilty to 44 counts in connection with the shooting, but in January, a federal grand jury indicted Bowers on additional counts, which included 11 hate crime charges. During the shooting, which has been described as the deadliest anti-Semitic attack in U.S. history, Bowers allegedly yelled at police that he wanted "all Jews to die." Federal prosecutors have not yet decided whether they will seek the death penalty for Bowers.

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