In court documents obtained by ABC11, the defendant in what's known as a criminal conversation lawsuit is listed as Christi C. Stem of Clayton.
Stem's website lists her as an attorney specializing in family law.
The lawsuit says Doyle and her husband Michael were married in 1996. It also says Stem and Doyle were close personal friends for 17 years and that Stem is godmother to the couple's children.
A "request for admissions" attached to the lawsuit asks Stem to admit or deny that Doyle confided information to her about problems with her marriage and even helped her find a private investigator to follow her husband.
The request charges that Stem offered to act as a mediator between the Doyles.
It then says that after that, Stem sent electronic messages to Michael Doyle in 2010 expressing romantic interest, and that they had sex prior to the July 4 weekend.
The lawsuit accuses Stem of "willfully and deliberately seduc[ing] the Plaintiff's spouse."
The alleged sex acts occurred in both Doyle's home and Stem's home.
"The acts of intercourse between Defendant and Plaintiff's spouse have caused the Plaintiff to suffer great mental anguish, humiliation, injury to physical and emotional health and the loss of assistance and financial support of her spouse," the lawsuit continues.
The lawsuit seeks damages in excess of $10,000 and punitive damages in excess of $10,000.
North Carolina is one of several states where spouses can sue for alienation of affection or criminal conversation if they can prove adultery and damages.