RIVERSIDE, Calif. (AP) - A girl has testified that her 10-year-old brother, the son of a neo-Nazi leader, planned for four days to kill their father before he took a gun from his parents' bedroom closet and shot him in the head.

The Riverside Press-Enterprise says the testimony came Wednesday during the second day of the boy's murder trial in juvenile court.

The boy, now 12, is charged with the May 2011 killing of his father, 32-year-old Jeff Hall.

Prosecutors say the boy told his sister about his plan while they were playing on a swing set.

The boy is not being identified by The Associated Press because he is a juvenile.

If a judge decides he killed Hall, he could be in state custody until age 23.

Copyright 2013 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.