J.T. and Colleen become embroiled in Lily Winters' (Christel Khalil) drama with internet predator Kevin Fisher (Greg Rikaart). They discourage Lily from being with him. After Lily engages in illegal intercourse with him, Colleen tells Lily's parents, Neil (Kristoff St. John) and Drucilla (Victoria Rowell). They have him arrested. In retaliation, Kevin attempts to murder Colleen by locking her in a freezer inside a burning building. J.T. rescues her and carries her out of the building. The couple moves on from the Kevin ordeal as J.T. begins to focus on his music career. This serves as a roadblock in their romance as Colleen becomes jealous of J.T.'s closeness with other girls in his music video. During a press conference, he also lies to a reporter about not having a girlfriend. Though he attempts to explain why he did that, Colleen decides to move back to New York to live with her mother so she will not be standing in the way of J.T.'s career. During her time away, he develops romantic feelings for his long-time friend Brittany, who plans to marry Bobby Marsino (John Enos III). Colleen returns to Genoa City briefly and J.T. deals with his feelings for both her and Brittany. She ultimately leaves town again and returns in 2006 intent on reuniting with J.T. However, he is dating Mackenzie Browning (then played by Rachel Kimsey) at the time. Colleen attempts to break them up. Ultimately, Mac's dependence on Kevin during her pregnancy and miscarriage, as well as J.T.'s cheating with Victoria Newman (Amelia Heinle), break the couple up. Not long after that, he and Colleen reunite. Colleen moves in with J.T. Shortly afterwards, they make love for the first time. His career as a private investigator causes trouble in their relationship since he is forced to keep secrets about his job from her. Colleen looks through his files and discovers that he is investigating her father. She forgives him for this, but is continually annoyed that he is unable to share information he has about his cases. She also develops an attraction to her college professor, Adrian Korbel (Eyal Podell). Trapped together during a snowstorm, Korbel and Colleen engage in sex. Guilty over the affair, she confesses to J.T. who breaks up with her. When Jana Hawkes (Emily O'Brien) attempts to murder Colleen and Kevin by trapping them in the freezer of a building she set fire