Moises Meraz-Espinoza, 18, is scheduled to be arraigned in the afternoon.
Authorities say he admitted to killing his mother, 42-year-old Miralda Espinoza. Her body was found stuffed in a freezer in their Maywood apartment over the weekend.
The L.A. County Coroner's Office revealed that Espinoza died of asphyxia and neck compression.