A woman charged in the arson death of a mentally retarded woman in her care will undergo testing to determine whether she is competent to stand trial.

Second Circuit Judge Alfred C. VanWagenen on Thursday rescheduled a preliminary hearing for Tonya Vosburgh and her husband, John Vosburgh, for Jan. 20. The Vosburghs, formerly of Layton, are charged with murder, aggravated arson and filing a false insurance claim.They are accused of setting the fire at their Layton home that killed 18-year-old Bobbi Jo Womack, whom the couple cared for under an agreement with Womack's mother.

The defense claims Tonya Vosburgh injured her head when she fell on a sidewalk in July. That injury reportedly resulted in an aneurysm that required brain surgery on Aug. 4.

Since then, according to court documents, the 33-year-old woman has suffered an organic brain disorder and seizures that have resulted in hospitalizations.

Other court records filed by her attorney, Randall Gaither, state that a stroke has cost Tonya Vosburgh the use of her arms, some of her ability to speak and some of her memory.

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"Tonya Vosburgh is mentally unable to conduct her own affairs, to care for herself and now requires long-term nursing care," Rick Vosburgh, 43, filed a petition with the district court asking to be appointed his wife's conservator. A hearing on the matter is set for Dec. 2.

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