How did Duane Dog Chapman's two children die?

On one of his shows it showed his daughter had been killed in a car accident on her way home from wedding rehearsal for her dad and his wife when they were going to renew their vows. I hadn't heard about another child of his dying.

His son, Zebediah, was born premature and died 30 days after his birth

His daughter, Barbara Katie, was not on her way home from the wedding rehearsal. She was in Alaska where she had lived with her mother, Duane's ex wife. That was in 2006