Betty Broderick was convicted of murdering her ex-husband, Daniel T. Broderick III, and his second wife, Linda (Kolkena) Broderick, on November 5, 1989. At a second trial that began on December 11, 1991, she was convicted of two counts of second degree murder and later sentenced to 32-years-to-life in prison.
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RESOURCES:

• Watch Betty Broderick | Snapped (oxygen.com)
• Friends Bid Slain Couple a Bittersweet Farewell - Los Angeles Times (latimes.com)
• Betty Broderick: Shocking Case Featured on Oxygen's 'Snapped' (people.com)
• ‘Dirty John’: Who Was Linda Kolkenna, Dan Broderick’s Second Wife? | True Crime Buzz (oxygen.com) 
• Betty Broderick's prison love letters found in San Diego | cbs8.com
• The Strange Truth About The Betty Broderick Story (nickiswift.com)