The 20-year-old Jackson, who was due to deliver her baby in March of last year, was shot to death inside Fox's mobile home in Lansing.
Fox also is accused of plotting to kill Jackson in a Jan. 11, 2008, bombing in Leavenworth.
A Leavenworth County District Court on Thursday granted a defense motion to continue the trial for Fox, who is charged with capital murder and conspiracy to commit first-degree murder.
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