Faked an e-mail from Ridge Forrester telling Taylor Hayes it was okay to impregnate her 
Sicced a python on Clarke Garrison in an attempt to kill him 
Kidnapped Steffy Forrester and let her parents think she was dead 
Kneed a boat captain in the groin 
Kidnapped Taylor Hayes 
Seduced Tim Reid into helping her confine Taylor 
Held Ridge Forrester and Taylor Hayes at gunpoint 
Tried to drown Stephanie Forrester in a bathtub 
Brought an amnesiac Ridge to Venice and pretended to be his girlfriend 
Faked an e-mail from Ridge telling Brooke Logan he was leaving her 
Hired an impostor "Brooke"¯ 
Plotted to get pregnant with Ridge's baby 
Morgan DeWitt was a teenage model who fell in love with older designer Ridge Forrester, but when Morgan got pregnant, Ridge's mother, Stephanie Forrester, forced Morgan to get an abortion. Morgan left modeling behind and became a fashion designer, and several years later she was hired as a liaison to the design team at Forrester Creations by Brooke Logan, which put Morgan back in Ridge's orbit. Morgan was soon promoted to head designer by Brooke, who was striking back at the Forresters for ruining her relationship with Ridge's brother, Thorne Forrester; Morgan enjoyed seeing her designs on a Forrester runway.
Morgan went out on a date with Clarke Garrison, who designed for the competition, Spectra Fashions; though Morgan and Clarke kissed, Morgan didn't feel things would go anywhere with him. Morgan went on a business trip to Paris with Ridge and had such erratic mood swings that she had no choice but to confess her abortion to Ridge, who had no idea she'd been expecting his child. Morgan befriended Ridge's wife, Taylor Hayes, confiding in her about her desire for a baby. Morgan and Taylor visited fertility clinics together, but Morgan's real plan was to get pregnant by Ridge; Morgan borrowed Taylor's laptop when Taylor went out of town to see to her sick father, Jack Hamilton, and faked an e-mail from Taylor telling Ridge she was all right with Ridge impregnating Morgan.
Morgan told Clarke about having sex with Ridge and getting pregnant, swearing Clarke to secrecy. But Morgan's pregnancy was revealed when Morgan bought herself baby items and was caught by Taylor, prompting Stephanie to pretend she was Morgan's aunt to get the truth out of Morgan's obstetrician. Morgan told Ridge, who knew the truth, that she was not going to have another abortion; Morgan and Ridge agreed to keep her baby's paternity to themselves. Morgan was happy when Stephanie had a friendly chat with her over some tea, but when she found out Stephanie laced her tea with a drug that would have caused a miscarriage had she consumed it, Morgan vowed revenge on Stephanie.
Morgan learned she was having a boy and lied to Taylor that she'd been artificially inseminated. Standing on a chair to reach a book, Morgan fell but emerged with only a small tear in her placenta. Angry that Clarke had ruined her chances with Ridge by telling Ridge he knew Morgan was having his baby, Morgan sicced a python on Clarke and nearly killed him; Morgan threatened to finish Clarke if he told Taylor she was pregnant by Ridge. But after Ridge told Taylor himself, Morgan and Taylor got into an argument that ended with Morgan falling down the stairs and losing her baby. Morgan refused Stephanie's genuine condolences about losing her child.
Hearing Taylor badmouth her, Morgan chewed up the psychiatrist's referral Taylor gave her and spit it in Taylor's face. Morgan agreed to leave town and accepted Stephanie's plane ticket, but returned to Los Angeles with Ridge and Taylor's baby daughter, Steffy Forrester, in tow; Morgan had followed Ridge and Taylor to St. Thomas and kidnapped the girl, with everyone believing Steffy had been washed overboard a boat and killed by a shark. Morgan dyed Steffy's hair red to match hers and renamed the child "Stacey."¯ Morgan fired her housekeeper, Norita, and threatened to hurt her husband and children if Norita said anything about her "daughter."¯
Getting herself rehired at Forrester after she threatened to sue, Morgan ran into Genoa City psychiatrist Tim Reid, whom Morgan had known as a teenager. When Taylor tracked Morgan down and heard Steffy in the other room, Morgan imprisoned Taylor in her basement and seduced Tim into helping her confine Taylor. With Ridge thinking Taylor had walked out on him, Morgan tried to entice Ridge but scrambled to explain when Ridge found a drawing of Steffy's in her purse. Morgan was thrilled when Ridge took her out for a fancy dinner, not realizing he was fishing for information; feeling Ridge was finally hers, Morgan prepared to shoot Taylor. But Morgan's plan was foiled when Ridge, who recognized Morgan's dogs from Steffy's drawing, crashed his car through Morgan's house and rescued Taylor.
Morgan went on the run with Tim, but heard the Forresters were hiring a clown for little Steffy's birthday and cast herself in the role. Morgan entertained the kids at Steffy's party and narrowly escaped detection when Steffy recognized Tim; when the party was over, Morgan cornered Stephanie alone. Morgan hit Stephanie and tried to choke her, going into the Forrester pool after Stephanie punched her. Morgan was left to die in the water, but she emerged and tried to drown Stephanie in her bathtub before finally being arrested.
Four years later, Morgan was released from an asylum and saw a disoriented Ridge at the Café Russe, hoping to apologize to him for what she did, but Ridge collapsed in front of her. Thinking Ridge was drunk, Morgan let him sleep it off in her hotel room, but when she told him that his new wife, Brooke, had called his cell phone, he didn't know who Brooke was. Morgan realized Ridge's memory lapse was caused by a concussion and spirited him away to Venice, Italy. Morgan removed Ridge's wedding ring and pretended they were together, then convinced her neurologist mother, Natalie DeWitt, to tend to Ridge's concussion. Though Natalie had been impressed by all the progress Morgan made in therapy, Morgan faked an e-mail from Ridge, telling Brooke he was leaving her, then hired an impostor "Brooke"¯ so Ridge could dump "Brooke"¯ in person. Morgan told Natalie she wouldn't let Ridge go until he'd gotten her pregnant to make up for the two babies she lost.
Morgan's scheme unraveled when Ridge couldn't make love to her because he had memory flashes of Brooke, and when Ridge's sometime adversary, Amber Moore, saw Morgan with the missing Ridge. Morgan tried to stop Amber from calling the police, then listened as Natalie took responsibility for Morgan's mental problems, admitting Morgan essentially grew up without a mother because Natalie was always working. Before Amber took Ridge back to Los Angeles, Morgan broke down, with Natalie promising to get Morgan more psychiatric help; Morgan was last seen crying in her mother's arms and hasn't been mentioned since.