Updated

A Northern California woman and her boyfriend have pleaded not guilty to charges that they beat the woman's 3-year-old daughter to death.

Napa County prosecutors say 23-year-old Sarah Krueger and 26-year-old Ryan Warner entered the pleas in court on Tuesday. They are each charged with murder and assault on a child resulting in death in the slaying of Krueger's daughter, Kayleigh Slusher.

Police found Kayleigh's lifeless body in her bed during a welfare check at Krueger's Napa apartment on Feb. 1. Warner and Kruger were arrested at a San Francisco Bay Area train station the next day.

Prosecutors also said on Tuesday that the coroner's office concluded Kayleigh died of multiple blunt impact injuries to her head, torso and extremities due to child abuse and neglect.