TRACY, Calif. — Police said Saturday they do not know what motivated the Sunday school teacher they arrested on suspicion of kidnapping and killing an 8-year-old girl whose body was found in a suitcase dumped in an irrigation pond.

Melissa Huckaby, 28, a local minister's granddaughter, was arrested late Friday about five hours after she drove herself to the local police station at the request of officers, said police Sgt. Tony Sheneman. She was being held without bail in connection with the death of Sandra Cantu, the San Joaquin County sheriff's office said.

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