EL DORADO, Kan. (AP) -- A judge has refused to let a southeastern Kansas woman withdraw her guilty plea in last year's killing of her boyfriend's grandmother.

Lyndsey Giovinazzo and Jacob Hoyt were both 19 when they were arrested in December 2011 in the death of Loyce Cody. The 69-year-old teacher was found strangled in her Augusta home; her car and debit cards were missing.

The El Dorado Times reports (http://bit.ly/V0JQjT ) Giovinazzo was in Butler County District Court on Tuesday, seeking to change her plea of guilty to first-degree murder.

Judge Jan Satterfield rejected the defendant's arguments that she received poor advice from her trial attorney.

Giovinazzo will be sentenced Dec. 13. Hoyt, who was Cody's grandson, is scheduled to go on trial Dec. 10.