Kenneth went to school with Zach at some point, he was an older classmate that he befriended at UH and ended up as roommates. His connection to the paralegal, I don't recall off the top of my head. But Zach was Kenneth's roommate and when Kenneth passed, all his stuff including his phone, was left behind in Zach's apartment. So when the paralegal called Kenneth's phone, Zach answered to let her know he had passed and somehow the conversation turned to her issues with Leon. As far as why didn't the uncle/attorney contact police regarding Leon, my best guess would be that money talks. Leon's mother, also an attorney, was good friends with the uncle/attorney. I'm assuming that also was a factor in not wanting to "jump" to contact authorities.