Prosecutors said the girl died after being abused by her mother.
Chavez lost custody of Kimberly shortly after she was born, when authorities said the baby tested positive for drugs, KTLA-TV reported. She regained custody of her daughter after completing substance abuse and parenting classes, but lost it again after she started abusing the girl, authorities said.
Kimberly went between foster care and her mother's custody during her short life, KTLA reported. Authorities said Chavez's abuse of her daughter continued until the girl's death.
Kimberly’s body has never been found.
As part of a plea deal, Omar Lopez pleaded guilty to child endangerment and perjury charges, the Ventura County Star reported. He is scheduled to be sentenced May 20.
A jury found Chavez guilty in December of second-degree murder, assault on a child causing death and torture. She pleaded guilty April 11 to several counts of perjury. She is scheduled to be sentenced Tuesday.