Betty Broderick, the woman convicted of murdering her ex-husband and his wife in their bed on Nov. 5, 1989, has died at 78. Officials at the California Department of Corrections and Rehabilitation told NBC News that Elizabeth A. Broderick — her full name — was transported from the California institution where she was incarcerated to a medical facility on April 18. She died the following Friday. The medical office listed her initial cause of death as natural; the San Bernardino County coroner will conduct an official examination. Broderick was convicted of second-degree murder in 1991 for the deaths of Daniel Broderick III, 44, and Linda Kolkena Broderick, 28, and was sentenced to 32 years in prison. She and Daniel Broderick married in 1969. In the late 1980s, Daniel began an affair with Linda Kolkena. He filed for divorce in 1985, setting off a four-year battle for custody of their children and the family home. Daniel was awarded custody; Betty received visitation rights.…