anjelica was an amazing big sister. cubs, as i called them, you know. andrea canning: when aj was eight years old, things between zach and aj's mom started to fall apart. at the same time, the relationship between aj and zach also started to fall apart. a divorce happened. there was a lot of strife between the family. andrea canning: then wesley came along. even though zach wasn't the biological dad, he fought for custody of aj and lost. zach was feeling marginalized from the family, his girls, and from anjelica. it must have stung when wesley adopted aj. now he's officially her dad. yes, she was anjelica hoffer for her whole life. before that. that was what everybody knew her as. i was angry and hurt, so it felt like it was a stab in the heart. andrea canning: detective benjamin wondered, could zach have felt betrayed, leading him to ultimately harm aj? did you bring zach in multiple times? multiple interviews, some very lengthy ones, some very-- some accusatory. how was zach acting as you're interviewing him he seemed