Filming began in April 2017 for the Twentieth Series of Midsomer Murders. Returning to their main roles are Neil Dudgeon, Nick Hendrix and Fiona Dolman, and joining the cast will be Annette Badland who will portray Dr. Fleur Perkins , the new Chief Pathologist. The twentieth series will consist of 6 episodes.
| Name | Portrayed by | Occupation | Notes |
| John Barnaby | Neil Dudgeon | Detective Chief Inspector, Causton CID | |
| Jamie Winter | Nick Hendrix | Detective Sergeant, Causton CID | |
| Sarah Barnaby | Fiona Dolman | Wife of John Barnaby | |
| Fleur Perkins | Annette Badland | Chief Pathologist of Midsomer County. |
| Ep ID | Title | Director | Writer | Air Date |
| 20.1 | The Ghost of Causton Abbey | Matt Carter | Helen Jenkins | |
| 20.2 | Death of the Small Coppers | Paul Harrison | Chris Murray | |
| 20.3 | Drawing Dead | Toby Frow | Jeff Povey | |
| 20.4 | The Lions of Causton | Matt Carter | Nicholas Hicks-Beach | |
| 20.5 | Till Death Do Us Part | Audrey Cooke | Helen Jenkins | |
| 20.6 | Send in the Clowns | Nicholas Laughland | Julia Gilbert | |
| Midsomer Murders - Series | |
|---|---|
| 1 • 2 • 3 • 4 • 5 • 6 • 7 • 8 • 9 • 10 • 11 • 12 • 13 • 14 • 15 • 16 • 17 • 18 • 19 • 20 | |
