The case involves the MacNeill family of Utah County.
In 2007, Michele MacNeill was found dead in the bathtub of the home she shared with her husband of 29 years, Dr. Martin MacNeill.
Since her death, several allegations surfaced about Martin MacNeill that led family members to believe that the man they knew as a father and successful doctor was responsible for their beloved mother's death.
Other revelations about Dr. MacNeill shocked them even more.
Life of Lies, a special presentation of 20/20 will air at 9:00 p.m. Friday on ABC 4.
For a preview of the MacNeill story, click here.