Detectives have also said now that the home that Josh Powell blew up in Graham, Wash., was a sham that was exclusively set up for the social worker visits with his boys.
Pierce County authorities said that Josh Powell was still living at his father's home right up until his death, and only rented a small home nearby to convince authorities that was where he was living so he could regain custody of his children.
Neighbors at the rented home told police they never saw Powell there, while his father's neighbors said Josh Powell was there all the time. Police also said the home was decorated with pictures of the boys' missing mother.
Meanwhile, Steven Powell, Josh Powell's father, has submitted a notice to law enforcement in Pierce County Superior Court invoking his Fifth Amendment right to not answer questions posed to him by authorities about the case.
Steven Powell, who has been in jail since investigators found thousands of images of child pornography and graphic decorations on his compute, had previously been outspoken about his daughter-in-law's disappearance, making statements to the media about how Susan likely ran away from her family to be with another man.
In an exclusive interview with ABC News late last year Steven Powell said that he said that he had a relationship with Susan Powell that went beyond the fray, which included sexual touching, and admitted that he was in love with her. Police have now called him a "person of interest" in her disappearance.