Jessica Adams of Allentown has pleaded guilty in the November death of her 5-year-old son.
The plea was entered Friday in Lehigh County Court.
Police charged the 25-year-old Adams with beating her son to the point of unconsciousness at her home on North 12th Street last November. The boy died at the hospital the following day.
Adams initially was charged with criminal homicide but negotiations resulted in her guilty plea on the lesser charge of murder in the third degree.
Charges of endangering the welfare of a child were dropped.
Sentencing is scheduled at 3 p.m. Aug. 19.