Say it ain't so.

Grey's Anatomy fans adore him, but according to a new book by the show's director, McDreamy might be the last thing they'll be calling Patrick Dempsey. It has been alleged that the actor wasn't as pleasant on set as we all once would have thought, with the book claiming there were a lot of "HR issues" by the time he left the series. Starring as Derek Shepard for 11 seasons, Patrick has now been accused of "terrorising" the Grey's set after an extract from the book Inside Story of Grey’s Anatomy, based on the series, by executive producer James D. Parriott was released to the Hollywood Reporter. He said: "There were HR issues. It wasn’t sexual in any way. He sort of was terrorising the set. Some cast members had all sorts of PTSD with him. "He had this hold on the set. The network and studio came down and we had sessions with them. I think he was just done with the show." Adding that Patrick "didn’t like the inconvenience of coming in every day" as his stint on the series came to an end, it was also claimed that his co-star Ellen Pompeo also began to feel the tension. James added: 'He didn’t like the inconvenience of coming in every day and working. He and Shonda [Rhimes] were at each other’s throats." Fellow producer Jeannie Renshaw also said: "A lot of the complaining … I think Shonda finally witnessed it herself, and that was the final straw. "Shonda had to say to the network, ‘If he doesn’t go, I go.’ Nobody wanted him to leave, because he was the show. He and Ellen. Patrick is a sweetheart. It messes you up, this business." According to the book, Patrick began "complaining" if he had to stay "late" for longer shoots, which began getting on Ellen's nerves towards the end of season 11. Dempsey has yet to comment on these claims. The actor recently left Ireland after spending much of the summer filming his latest project, Disenchanted.