Walker has been widowed since Piper was a baby. And ever since, he has had difficulties managing his career and raising Piper himself. Walker wants to provide financial security to her, but he works so hard that he has become a Workaholic. This makes him an absent father to Piper, making both of them have even less time to spend together. This caused Piper to dislike him, as they have very poor relationship to each other. Even though she dislikes him, Walker actually loves his daughter very much, but couldn't express his feelings. He wishes to fix their relationship before it's too late.