When mother of two Nikki Entzel reported a house fire at her North Dakota home in January 2020, it appeared to be a senseless tragedy when police found her husband Chad Entzel’s badly burned body still inside. As investigators dug deeper, inconsistencies at the crime scene and in Nikki’s story revealed something more sinister at play. A new “20/20” reports on the dangerous love triangle between Nikki, Chad and Earl Howard and how it ended with murder and arson. The two-hour program features shocking security camera footage documenting the events leading up to the crime. The episode also features ABC News correspondent John Quiñones’ exclusive jailhouse interview with Nikki, who explains her relationship with both men and what she claims really happened to her husband.