The judge told the defendants he regards them as dangerous men. He told Kevin Liverpool it was a "crazy scheme by a crazy person which was likely to fail... It was your intention to kill Joss Stone and to rob her. I regard you a very dangerous man".
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The 43-year-old convicted German child sex offender, currently in prison in his home country, has been named as Christian B.
Robert McCabe and Aaron Torgalski pleaded not guilty to second-degree assault and were released without bail.
Late sunshine with blustery downpours slow to ease in places