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The jury sent a note to the court Wednesday, telling them, "After sufficient deliberations, we cannot unanimously reach a sentencing verdict."
Judge Diane Gibbons read the jury what’s known as the "dynamite charge," telling them it’s their job to come to a unanimous decision. She then sent them back to continue.
Sullivan pleaded guilty to first-degree murder for killing 14-year-old Grace Packer.
If the jury cannot reach a unanimous verdict, Sullivan will get life without parole.
His co-defendant, the girl's adoptive mother Sara Packer, will officially enter her guilty plea once this is concluded. She will be sentenced to life in prison.