Betty Broderick, the woman who shot and killed her ex-husband and his new wife in cold blood, has died. We're told Betty had been transported from the California Institution for Women prison to an outside medical facility back in April ... and she died in the facility. CDCR says the doctor who pronounced her dead determined she died from natural causes ... though the San Bernardino County Coroner will determine her official cause of death. Betty was serving a 32-year-to-life sentence for murderi