Dempsey played the role of Derek from the shows inception in 2005 until 2015, after starring in 11 seasons of the medical drama.

He left the show to focus on his family and his passion for auto-racing.

Speaking to People, Dempsey explained leaving Greys Anatomy was simply the end of a chapter.

He said: Im very grateful for Greys Anatomy. Its given me the opportunity to do everything. But at the same time, there was a cost.

I think after a certain period of time, no matter how much money you make, you want control out of your own schedule.

See the article here:
Grey's Anatomy: Why did Patrick Dempsey leave the series? - Express