When he found out that his mother had an affair with a former football player, Doc Reese, Casey decided to go live with his father.
At age 16, Casey met a girl named Celia Ortega and despite her brother's arguments, the two started to date.
Knowing this would hurt Celia, who he had a secret crush on, Casey's best friend, William Munson said he was the baby's father.
Casey, however, acted like nothing was going on and told the entire neighborhood that Gwen was a cheap girl who slept with everyone.
Rosanna's sister Carly Tenney-Snyder took custody over the boy, Rory Cabot, but that wasn't what Gwen wanted.
Green, Casey helped her, which ended in exposing the kidnapping of Henry Coleman, Maddie's older brother.
Margo reminded her son what happened the last time he was "making out", while Casey tried to convince his mom they were just kissing.
Casey was heartbroken but wanted to show Maddie he was over her, so he started dating Lia McDermott again, an old girlfriend.
In the hospital, Maddie told Casey why she was so scared to make love to him; she was raped once by someone she thought to be her friend.
His plan backfired when Casey confessed that he had stolen stocks belonging to Will from the safe at Crash to pay off a gambling debt.
As a minor and the son of a cop, Casey was released with bail and could go back home, as long as he didn't leave Oakdale until his trial was over.
That same night, Adam was forced by his two brothers to leave Oakdale, a chance to escape jail time.
Scared that they killed him, Gwen and Maddie dug a grave and buried Adam, unaware that he was still alive.
In the cabin, more than a year after they met, Casey and Maddie finally made love for the first time, after she confessed that it was her sister's husband who raped her.
Maddie felt guilty because of Casey, but was unaware that she was also hurting her best friend Luke Snyder, who was in love with Noah.
Casey then unwillingly pretended to be Luke Snyder's boyfriend, in a bid to keep Ameera Ali Aziz in the United States.
Casey had a crush on Ameera but her visa was out of date, so she married Luke's boyfriend, Noah Mayer.
After hanging out around the house for a while, Casey got offered the job of being Emily Stewart's personal assistant, of which Margo disapproved.
Shortly thereafter, Casey confessed to Emily that while he had worked at the Lakeview he had stolen money from the register to pay off the guard who had arranged for his early release from prison (resulting in another bartender's having been blamed for the theft and fired).
Margo decided not to have Casey arrested, but under the stipulation that he stop seeing Emily, and that he enroll in college.
More patients, such as Meg Ryan, Alison Stewart and Chris Hughes were admitted as well and a plaque was discovered.
Emily believed they would be all right soon again, but it changed when presumed dead Dusty Donovan returned to town, with whom she had a short fling before his so-called death.
Casey now spends more time with Ali, who was recently divorced, and he is slowly starting to move on again with his life, accepting he and Emily weren't right for each other.
When Alison's deception is discovered, she's kidnapped by masked men on Halloween, taken to a dorm room and forced to strip as they videotape her.
Casey reprimands Noah, then confesses his crime to the dean, claiming that he acted alone and that Luke did nothing wrong.
Alison is given the assignment of looking after a college student who overdosed on drugs, and is horrified to realize that it's Mark, the man who kidnapped and sexually harassed her.
Meanwhile, Alison receives a text message from Lucy Montgomery, who's back in Oakdale in search of a bone marrow transplant for her brother Johnny.
She arrives at the Hughes' house to get a sample from Casey, where he tells her of his plans for his New Year's Eve date with Maddie.
While they're waiting for Luke and Noah to reconcile, Casey reveals some acquired maturity, claiming that he's seeking a substantial relationship rather than a brief fling.
Alison responds skeptically but is intrigued by this change of attitude and shows more willingness to take a chance with him.