Kelly Andrews moved from St. Louis, and had not been living in Genoa City long when she met Billy Abbott at a grief counseling session. Billy shared with her that he had recently lost his seven-year-old daughter, Delia, to a hit and run driver, and the guilt he felt for leaving her alone in the car. Kelly could relate, as her seven-year-old son, Sam, had been killed while riding the bicycle that she had bought him. Billy was married to Victoria Newman, who grieved with him for Delia, but Delia's mother was his former wife Chloe. Kelly told him that she and her husband had divorced after Sam's death, and Kelly had moved to Genoa City to get away from the memories. Kelly and Billy bonded, and appearing to get more comfort from each other than from the group, they began meeting alone instead.
Running into each other at Crimson Lights, it quickly became evident that Kelly and new Genoa City doctor, Ben "Stitch" Rayburn, knew each other from the past. Kelly commented, "She was going to find out anyway, it just came up, and wasn't intentional. I take it you and your wife are over?" Ben told her, "We are not going to talk about my wife. In fact, we are not going to talk at all."
After Victoria left for the airport to spend Christmas with her son, Reed, Billy ran into Kelly who was crying and alone on Christmas. Billy took Kelly home to her apartment and in a weak moment, they ended up having sex. After Victoria's flight was grounded by weather, Billy arrived home to find her there, and guiltily promised to change and never let her down again. The next day he gave Victoria roses, and she was so delighted that when she ran into Kelly later, she invited Kelly to dinner. Then Victoria included Dr. Ben when he dropped off her lost cell phone. The get-together became very uncomfortable for everyone but Victoria. When Victoria brought down baby Johnny, Kelly got emotional and left, and Dr. Ben left soon after, leaving Victoria and Billy to have dinner alone.
The next day Billy met with Kelly where she worked at GC Cares, and Kelly asked him to become the director of the Delia Project which was being funded by an anonymous donor. After telling him that his mother Jill had agreed to be on the board and had suggested him as director, Billy accepted.
Dr. Ben caught Kelly coming out of Billy's hospital room after Billy was involved in a car accident, and he accused Kelly of sleeping with Billy. Kelly admitted it had just been once, a mutual sharing of their losses. Ben warned her not to let it happen again. Kelly lashed out at Ben, calling him Benji, saying that she was not the reason his wife wanted nothing to do with him, that their relationship had finished before it started. Then referring to Adam Newman's apparent hit and run of Billy's daughter Delia, said, "Who could do something like that, then just go on with his life?" That comment seemed to have struck a nerve with Ben.
Billy and Victoria attended the Delia Project Valentine's Day benefit, as did Kelly representing GC Cares. They all ended up being taken hostage in a botched robbery attempt by Richard Womack. Womack fired at the chandelier, which fell on Billy, injuring him. Then when Billy tried to jump Womack, he kicked Billy, breaking some ribs. Victoria cradled Billy while Kelly tried to administer first aid. Billy began babbling, apologized, and confessed to sleeping with Kelly. Victoria told Kelly to get her hands off her husband, slapped Kelly, and called her a tramp. After everyone was released in an exchange for a plane to escape, Colin Atkinson jumped out from where he had been hiding, and Womack was killed as he and Colin struggled over the gun.
After Billy and Kelly's one night stand had been exposed, Ben became concerned for Victoria, and while consoling her they ended up kissing. Victoria admitted it to Billy, and Billy warned Ben to stay away from his wife. But when Victoria found out that Billy had gone to console Kelly, she accused him of putting Kelly first and kicked him out. Since Billy had made it clear that he still wanted his marriage, Kelly lamented to Ben how sad and lonely she was. Ben told Kelly that she could have him now that his wife was divorcing him. Kelly said that there would be no forgiveness for what he had done. Kelly claimed that she could not get over Billy, so she was leaving her job at GC Cares to avoid him. Finding out that Ben had kissed Victoria, Kelly commented to Ben that Victoria would not want to be involved with a murderer. She later reminded Ben that he had killed a man, and that he had already told Billy that he had done something unforgivable in his past.
Lily Ashby came up with an idea to boost the athletic club's post-Womack slump by suggesting Jabot premiere Chelsea's new fashion line there with a fashion show. Having made friends with Kelly, Lily hired her to be her assistant during the show.
Billy's brother, Jack, agreed to give Billy a place to stay, and in trying to help his situation, Jack invited Kelly to dinner and tried to pay her off to leave town, but she tore up his big check. Realizing that Kelly was a better person than he had assumed, Jack tried to form a truce with her, and convince her to go to dinner again. Jack, whose wife Phyllis had been in a coma for eight months, realized that after working with Kelly and running into her now and then, he was finally beginning feel good again. Thinking that maybe it was time to give up on her, Jack checked in on Phyllis, but there was still no progress. Jack ran into Kelly again and he took her with him to a Vivaldi concert in the park, where they began quoting old movies, and realized they had the same old favorite in "Vertigo". Jack kissed her and asked her on a real date.
Billy confronted Stitch, telling him that he intended to find out what Stitch did not want anyone to know from his past. Stitch told him to look all he wanted, that he would not find a thing, so Billy began searching the Internet. Ben asked Kelly not to tell anyone about his past. And Kelly, who was now happily hoping to get a teaching position in the fall, and falling for Jack Abbott, agreed that they had both destroyed each others lives, but it was time for them to forgive and move on.
During their real date, Jack and Kelly kissed again and decided to get a room at the athletic club. Kelly was waiting in some sexy lingerie, but when Jack arrived, fresh from an encounter with Summer, he called it off, feeling disrespectful of Phyllis. After Noah spoke to Summer, Summer told Jack that she really could not begrudge him a life other than waiting for Phyllis to wake up. Jack told Kelly he wanted to resume where they left off, but Kelly decided that she did not want to be hurt when Phyllis woke up one day.
As a favor for Chelsea, Jack showed up to meet a new tenant for a condo that Adam owned, and found it was Kelly. She accused him of stalking her, and Jack said he felt it was fate throwing them together. As she was about to leave, they heard a violin next door playing Vivaldi, and Jack asked her if she still did not believe in fate. Kelly took the apartment, and moved in to find vases of flowers and a picnic arranged on the floor. Jack arrived shortly afterward and got her to talk about herself. She spoke about how her father died when she was in college and devastated her. How she married hastily for some stability, then had Sam, who died and devastated her again, and resulted in divorce. Jack and Kelly began dating, and Jack was elated to find that he could be happy again. Summer became upset that Jack had given up on her mom, but she said she understood that he could not wait forever, and would try to accept Kelly. Jack and Kelly christened Kelly's new place by making love.
Kelly, in speaking with Ben again, referred to him as "a man who doesn't even exist" and urged him to tell Victoria the truth about his past. She also said that Ben had taken away someone she loved, then when Sam died, she had lashed out and told Jenna about it. Ben decided to break up with Victoria, but they ended up making love instead. Later, Ben told Kelly that Victoria's husband Billy had gone to see his ex-wife Jenna, and that he could not bare to lose anyone he loved again. Kelly hugged Ben and assured him that through it all, she still loved him – while Jack looked on. Jack later confronted Kelly about her relationship with Ben, assuming they had once been lovers. But Kelly surprised him by admitting that Ben was actually her brother. Kelly explained that Ben had done something unforgivable, so she had cut him out of her life for years. Although Ben had reached out to her after her son Sam died, Kelly felt it was unfair that Ben was happily married while she had lost everything, so she told Jenna what Ben had done, and it had broken up his marriage.
Kelly shared with Jack that she came from a poor family, attended boarding school on scholarship, and got straight A's. Jack finally got Kelly to tell him Ben's secret, that her brother had murdered their father, their mother had taken Ben's side, and that he had served his time for it. She said that she had forgiven him, he was a doctor saving lives now, and felt that Stitch deserved a chance to start over. So Kelly hoped that Jack would not tell Billy. Jack did not, but Billy confronted Stitch with the truth in front of Victoria, Kelly, and Jack, and was shocked to discover that Jack and Kelly had known and not told him, so told them they could both go to hell. Later, trying to defend his not informing Billy, Jack admitted to Kelly that he was in love with her. Kelly rebuffed him, but later after realizing that Jack was the best thing to ever happen to her, she joined him in his bed and admitted that she loved him too. Jack visited Phyllis and said goodbye, telling her that he had fallen in love with someone else. Kelly moved in with Jack, they told Summer, who accepted it, but said that she still would never give up on Phyllis.
Kelly and Ben were surprised when their mother, Maureen, whom they had not seen since Kelly's son Sam's funeral, showed up in town. Kelly acted resentful, accusing Maureen of caring more about defending Ben than her own husband. Maureen calmly said that Kelly had always been a "daddy's girl". But Ben asked Kelly to give their mother another chance. Maureen wanted to stay in town because Ben may have a baby on the way and to try to be a family again, but she had no money, so Kelly got her a room at GCAC. Later Kelly took Jack to meet her mother, and Jack charmed her.
Just before Sharon and Nick were pronounced man and wife again, everyone was shocked when Phyllis interrupted the wedding, walked down the aisle, was embraced by Summer, and collapsed. It turned out that Phyllis had woken up from her coma, stolen a nurse's scrubs, and hitchhiked home from the Georgia hospital. Kelly saw the writing on the wall, and when Jack arrived home he found her moving out. Jack convinced her to stay, but woke up the next morning to find a goodbye note instead.
Jack took Phyllis home to Abbott Manor with instructions not to cause her undue stress which could send her back into a coma, so he did not tell her about Kelly. But Phyllis came home unexpectedly and walked in on Jack and Kelly who were looking emotional, and asked who she was. Jack said she was an event planner at the club, and a friend of Billy's. Later Kelly gave Jack an ultimatum, he had to choose between Phyllis and Kelly. Still waiting, Kelly saw Jack a few times, but he was always vague and confused. Meanwhile, Kelly got word that her mother Maureen was in the hospital after suffering a heart attack and she sat up all night with Ben awaiting the outcome of bypass surgery. After the surgery, Jack met her at the athletic club, and told her they needed to talk. Jack attempted to tell Kelly that he had chosen Phyllis, but Kelly kept interrupting him. Phyllis arrived, broke the news that she and Jack were engaged, hoping Kelly could plan the perfect party for them. Kelly was heart-broken at the news, but Jack could do nothing to console her in front of Phyllis.
Ben realized that Kelly was upset, but told her that their mother had disappeared from the hospital, and that Kelly needed to know that Ben had not killed their dad. Their dad had been abusive, and Maureen had killed him. Kelly said their dad had never been abusive. Ben gave her the note that Maureen had left for her telling her the truth. Kelly reacted, asking how their mother could be so selfish to allow Ben to take the blame.
Kelly went to see Jack, and told him that she hated him for what he had done, allowing her to fall in love with him, then breaking her heart. Jack agreed that she had every right to, but he felt he had to honor the commitment he had made to Phyllis.
Phyllis confronted Kelly, accusing her of going after Jack when he was vulnerable, just looking to score another rich Abbott. Kelly set her straight, that they were in love and living together when Phyllis had returned. Phyllis insulted Kelly, Kelly slapped Phyllis and revealed that Jack had gone to see her to say goodbye. Jack broke them up, and tried to see if Kelly was all right and apologize. But Kelly let him know that Phyllis was a phycho, and that he was going to regret choosing Phyllis over her.
Jack chatted with Kelly while awaiting Phyllis' arrival at the athletic club on New Year's Eve. Kelly was alarmingly confident that Jack still loved her and would choose her eventually over Phyllis. Phyllis walked in late and disheveled after running out of gas, wearing the same dress as Kelly. Jack rolled his eyes as Phyllis attacked Kelly, claiming that Kelly had arranged for both coincidences to get back at Phyllis. Comments Kelly made to her brother Ben later confirmed it was probably true. A few days later Jack heard Kelly and Phyllis arguing in his office and a slap. As he came in, Kelly claimed that Phyllis had slapped her, and Phyllis maintained that Kelly had slapped herself.
A couple of weeks later, Kelly overheard Phyllis make arrangements to surprise Jack. A note was passed to Jack by the bartender while at the athletic club which said, "The woman you love has a surprise for you. See the desk clerk for the key to room 702." Being wary, Jack confirmed with the bartender that Phyllis had given him the note, but he gave Jack the key to 802 instead. Jack found rose petals on bed, the shower running, and another note telling him to take off his clothes, get in bed, ad put on the blindfold. Jack realized it was Kelly in a negligee who had joined him and was kissing him, jumped out of bed and confronted her, asking why should could not understand that he had chosen Phyllis. Kelly got angry, claiming that she had received a text from Jack inviting her there, and now he was breaking her heart all over again. Then Phyllis entered the room. Phyllis and Kelly accused each other of setting the other up. Jack finally believed Phyllis when the flower shop said that a blonde had ordered the flowers. Jack had it out with Kelly, telling her to stop the tricks, and she sobbed that she had never manipulated or lied to him.
Phyllis asked Kelly to tea to form a truce. Kelly offered to be understanding if what had been happening was because of some reaction to her coma treatment. But following their tea, Kelly passed out with dizziness and abdominal pain. The hospital discovered that she had been poisoned with antifreeze. Kelly told the police and Jack that it had to have been by Phyllis. After getting upset and smashing a vase, Phyllis began to accept that she might have a problem.
After police chief Paul spotted on the security footage a woman with red hair tampering with the security cameras before Kelly was poisoned, he arrested Phyllis. Police found anti-freeze in the trash at Abbott manor. Phyllis was sent to Fairview for psychiatric evaluation and help. Phyllis was found to be sane but calculating after Kelly was called in for a chat with the psychiatrist. Jack finally set Kelly straight, saying that he was committed to Phyllis, and that he and Kelly were never getting back together. Phyllis went to live with Victor and Nikki following her evaluation. Victor let Kelly know, offering to help her get Jack back. Later Kelly threatened Avery with a butter knife after she inferred that Kelly was the crazy one.
Kelly arrived at the Valentines party at The Underground just in time to see Jack exiting very upset. He grabbed her and took her into a storeroom and they had rough sex. Although Jack made her dress and sneak out alone, she went home convinced that she and Jack were back together. Later when she heard that The Underground had collapsed, she returned to check on Jack. Phyllis caught her, told her Jack had been trapped inside, and to leave. But Kelly replied that Jack had made love to her earlier, so had obviously now chosen her. They were interrupted with news that a dead body had been found inside the rubble of the club.