A California judge has found a boy was responsible for the second-degree murder of his white supremacist father when the defendant was just 10.

Riverside Superior Court Judge Jean Leonard made the ruling Monday in the case of the boy, who is now 12.

Prosecutors argued the boy knew what he was doing when he shot 32-year-old Jeff Hall _ a regional leader of the National Socialist Movement _ and the slaying was premeditated.

Defense attorney Matthew Hardy said his client grew up in an abusive and violent environment and learned it was acceptable to kill people who were a threat. Hardy contended the boy thought if he shot his dad, the violence would end.

The boy, who is not being identified by The Associated Press because of his age, did not testify at trial.

THIS IS A BREAKING NEWS UPDATE. Check back soon for further information. AP's earlier story is below.

A California judge plans to rule Monday whether a 12-year-old boy is guilty of murdering his white supremacist father while he was asleep.

Riverside Superior Court Judge Jean Leonard is hearing the case without a jury and is expected to read the verdict at a midmorning hearing. At issue is whether the boy, then 10, knew what he was doing was wrong and whether there was premeditation.

Prosecutors argue that the child killed his father to keep him from splitting up with his stepmother, who at first said she had killed Jeff Hall, 32, but then quickly retracted her statement. She was not charged in the case.

The boy's younger sister bolstered the prosecution's case by saying her elder sibling plotted the shooting days in advance. Hall, a regional leader of the National Socialist Movement, was shot at point-blank range with a .357 Magnum while he slept on a sofa in the family home.

Defense attorney Matthew Hardy said his client grew up in an abusive and violent environment and learned it was acceptable to kill people who were a threat. Hardy contended the boy thought if he shot his dad the violence would end.

The boy said in a videotaped interview with police that he didn't think he'd get in trouble because he saw an episode of "Criminal Minds" in which a child killed an abusive father and wasn't arrested.

Prosecutors maintained Hall's white supremacist beliefs had nothing to do with the crime. They noted the boy had a history of violence that dated back to kindergarten when he stabbed a teacher with a pencil.

Hardy said he hopes the boy, if convicted, would not be sent to a juvenile lockup but rather be placed in a private facility that offers therapy, medical treatment and schooling.