Derek Shepherd, a character from the popular medical drama TV series “Grey’s Anatomy,” was married to Dr. Addison Montgomery before he moved to Seattle to work at Seattle Grace Hospital. Their marriage ultimately ended in divorce, and this storyline played out over several episodes in the show.

Derek and Addison’s marriage troubles were first introduced in the Season 2 finale, which aired in May 2006. In this episode, titled “Losing My Religion,” Derek discovers that Addison had an affair with his best friend, Mark Sloan, and that she wants to try to save their marriage. Derek is understandably upset and decides to leave Seattle to take a job in another city, effectively ending their marriage.
The aftermath of Derek and Addison’s divorce is explored further in the Season 3 premiere, which aired in September 2006. In this episode, titled “Time Has Come Today,” Derek returns to Seattle after being gone for several months and attempts to move on with his life. Addison also comes to Seattle to work at Seattle Grace Hospital and tries to reconcile with Derek, but he is hesitant to give her another chance.
Throughout Season 3, the tension between Derek and Addison continues to build, and it becomes clear that their marriage is irreparably damaged. In the episode “Let the Angels Commit,” which aired in February 2007, Derek finally tells Addison that he wants a divorce. This scene is emotional and intense, with both characters expressing their pain and sadness over the end of their marriage.
The divorce between Derek and Addison is finalized in the Season 3 finale, which aired in May 2007. In this episode, titled “Didn’t We Almost Have It All?”, Derek and Addison both come to terms with the fact that their marriage is over and begin to move on with their lives. Derek begins a new relationship with Meredith Grey, while Addison leaves Seattle to start a new life in Los Angeles.
In summary, Derek and Addison’s divorce storyline played out over several episodes in “Grey’s Anatomy.” The marriage troubles were first introduced in the Season 2 finale, and their divorce was finalized in the Season 3 finale. The storyline was emotional and intense, with both characters struggling to come to terms with the end of their marriage.