Susan Powell's friends say she told them her concerns about Steven Powell were a major factor in the family's decision to move to Utah in the first place—to raise their children far away from her father-in-law.
"When I first met Josh they had just moved from Washington to Utah, and they were trying to get away from the influence of Josh's dad," Hallewell told ABC News adding that Susan had told him that Steven Powell would never be allowed to set foot in her house.
Just last week, in the latest of an ongoing custody battle between himself and Susan's parents Chuck and Judy Cox, Josh Powell made a declaration to the court that he was the best and safest person to be raising his two sons, saying he had proven to be "a fit and loving father."
Days later, he had donated the boys' belongings to Goodwill, seemingly preparing to murder the family he told ABC News in August he would always protect.
"The people who know me know that I'm a good dad," Powell told "GMA" in August. "I work hard. I put my sons first. I was a good husband. I took care of my family."
Stay with ABC News for continuing coverage of the Powell case and watch "Sins of the Father" on "20/20" Friday at 10 p.m. ET for an in-depth look at this family tragedy.