It's a story that made headlines across the country.

A small-town preacher was killed early one morning in his own parsonage as he slept.

This case would open a pandora's box of secrets -- because the pious and charismatic preacher, it seemed, was a different man when he stepped away from the pulpit.

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Dateline correspondent Keith Morrison previews the case.

"The Preacher's Wife" airs Dateline NBC on Monday at 10 p.m.

Read full story with exclusive interviews and photos here.