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Friday, March 12: A woman with a questionable past

It started with a divorced doctor calling a dating service. But his date wasn't quite what she appeared to be. And just over a year later, after their whirlwind romance and wedding, police would be saying the same thing about his death.

It looked like a suicide, but detectives discovered that this new woman in the doctor's life had an interesting past: Not only had she been married four times before, but one of her ex-husbands believes she had tried to kill him. Had she finally succeeded with husband #5?

NBC's Dennis Murphy traces Della's web Friday at 9 p.m. ET, 8 p.m. CT on Dateline.