Mark Sloan's departure from Grey's Anatomy was a result of both creative and personal decisions. The show's producers, along with Eric Dane, made the choice to conclude his storyline in a meaningful way. Below are some of the reasons behind his exit:
Creative Storyline
The writers of Grey's Anatomy wanted to give Mark Sloan's character a proper send-off, ensuring that his storyline ended with significance. His death in a plane crash was written to provide closure for his relationships with Callie and Lexie, as well as to create emotional depth for other characters.
Actor's Decision
Eric Dane, who portrayed Mark Sloan, decided to leave the show after nine seasons. In interviews, he expressed his desire to explore new opportunities and take a break from the demanding schedule of Grey's Anatomy.