THE PERFECT NANNY on "20/20?, Friday, February 21, 2014, 10 PM on ABC

Dr. Martin MacNeill was a physician, lawyer, father of eight and appeared to be the perfect husband. But when his wife Michele was found dead in their bathtub after routine plastic surgery, his children accused him of orchestrating her death. Although it was officially ruled an accident, Michele's daughters pressed authorities to investigate, and they uncovered a web of lies that Martin MacNeill had told stretching back 30 years. They also uncovered his young girlfriend named Gypsy who may have been his motive for murder. When "20/20? first reported the story, the MacNeill children were desperately seeking justice for their mother. Now, five and a half years after her death, a sensational trial in a Utah courtroom gripped the country for weeks as Martin MacNeill stood accused of premeditated murder. Elizabeth Vargas speaks to the children and the mistress after the stunning verdict. "20/20? airs on FRIDAY, FEBRUARY 21 (10:00 - 11:00 pm ET) on the ABC Television Network.

"20/20? is anchored by Elizabeth Vargas and David Muir. David Sloan is the senior executive producer.

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