The Frankford, Mo. woman who admitted at trial that she tried to destroy evidence used to convict her lover of murder pleaded guilty to charges of evidence tampering.
Rebecca Jeanne Kirk, 40, was charged in December in Pike County with two felony counts.
Kirk has been free on bond since December.
She entered the plea Monday during a court hearing in Pike County, according to the Pike County Clerk's Office.
An affidavit said that Kirk damaged or tried to destroy a rifle, ammunition and clothing at the request of Calvin Duane Pettey.
Pettey was having an affair with Kirk even as he was engaged to Sandra Fugate of Hannibal.
He was convicted in June of murdering Fugate on the same day Petty admitted the murder to Kirk.
The killing happened just two days before Petty and the victim were to be married.
He was sentenced to life in prison.
Kirk admitted on the witness stand at Pettey's trial that she followed through on the defendant's request to destroy evidence.
Lincoln County Associate Circuit Judge Ben Burkemper scheduled sentencing for 9 a.m. on Oct. 7.