A 14-year-old Champaign County boy accused of killing his father's girlfriend has been charged as a juvenile on aggravated murder and murder counts. Prosecutors say Donovan Nicholas waited Thursday night for 40-year-old Heidi Taylor at the rural Mad River Township home he shared with her and his father, lured her in and killed her. Authorities have not said how Taylor died or disclose a possible motive. The judge ordered a psychological evaluation for Nicholas, who remains in detention.