Tim Ward, the Tulare County District Attorney, said six of the murders occurred in Tulare County, two happened in Kern County, and one in Santa Barbara County.
Martinez is also facing allegations of lying in wait, kidnapping, and murder for financial gain. The combined charges make him eligible for the death penalty.
The murders spanned a 30 year period. Martinez has been tied to a double homicide in Ocala, Florida in 2006. Martinez was arrested in Alabama and authorities there said he has confessed to over 30 murders -- including 11 in California.
Authorities said Martinez claims he was an enforcer for Mexican Drug Cartels. He claimed he would be called when someone had not lived up to their obligations.