Bill nearly left his marriage to Katie for Steffy Forrester (Jacqueline MacInnes Wood), but Katie, a heart transplant recipient, had another heart attack when she learnt of the news. According to the actress, "The idea that Bill would cross the line with Steffy is totally foreign to Katie. She just doesn't believe it's possible." Explaining how it happened, Tom said "Taylor (Hunter Tylo) comes over and says, “Listen, your husband and my daughter are involved.” And Katie’s, like, “Your daughter is sick and needs help. She’s obsessed with my husband and she’s living in a fantasy world!” But it’s at that point that a seed of doubt is planted, since Taylor is not the type to make stuff up. Then when Bill comes in I have this two-page monologue where Katie tells him what Taylor said and through it all Bill says nothing. It becomes clearer and clearer that things are not the way Katie thinks they are."