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Sergei Carlson now scheduled for trial Sept. 15 at the Burleigh County courthouse.
The 16-year-old Carlson is charged with murder and a deviate sexual act in the death of his 16-year-old sister, Whitney Carlson, on July 13, 2007, in Fargo.
Judge John Irby rejected a plea agreement in May that called for a 30-year prison sentence, but later agreed to move the trial from Fargo.
Authorities said Sergei Carlson told police he strangled his sister in her bedroom with his hands, put pillows over her face to muffle her sounds, then had sexual contact with her.
Sergei Carlson, who is called Isaac by family members, was adopted from Russia when he was 7 years old and moved with his father to Sun Prairie, Wis., in 2002. Whitney Carlson lived with her mother in Fargo.
