A California teen confessed to killing his mother, cutting up her body and putting the remains in a freezer, authorities said on Sunday.

Moises Meraz-Espinoza walked into a police station in Huntington Park, just south of Los Angeles, and allegedly told police of the murder and where the body could be found.

A dismembered body was found in the 19-year-old's home, but the identity of the body has not yet been confirmed, authorities said.

"The condition of the body precludes making her readily identifiable," said Coroner's Lt. Brian Elias, the Los Angeles Daily News reported.

Meraz-Espinoza is being held without bail and was booked on suspicion of murder, police said.

"I knew either he was gonna harm himself or someone but... not her," a family member said, according to CNN.

The woman did not want to show her face or share her name, but said she got a call from her cousin Meraz-Espinoza, who she claims admitted to her that he cut up his mother's body with a saw.

"[He's] very mentally unstable," she said.