These people were loved ones of serial killers. Sierra Barter’s family held close a monstrous secret. And this year, it was her mission to discover the truth. Joseph James DeAngelo Jr. is known as the Golden State killer. In 2020, his brother-in-law of 40 years, James Huddle, spoke out about him. In 2017, a woman had no idea that the man she was having an affair with was one of America's most notorious serial killers. Inside Edition Digital’s Andrea Swindall has more.