The Sunday school teacher charged with killing 8-year-old Sandra Cantu of Tracy, Calif., and stuffing her body in a suitcase was a good mom to her 5-year-old daughter – and didn't seem capable of hurting anyone, Melissa Huckaby's ex-husband told Good Morning America on Friday. "My initial reaction was shock and complete disbelief," said Johnny Huckaby, who has been divorced from Melissa Huckaby since Sept.