I messed it up, lost my head and admitted everything! Sorry, Jackie. I've let you down.
~ Simon's final words.

Simon Doyle is the secondary antagonist of Dame Agatha Christie's famous 1937 Hercule Poirot novel, Death on the Nile, and its adaptations.

Whilst originally being presented as a major protagonist, he is revealed at the novel's climatic denouement to be the direct killer of Linnet Doyle (who is the first and primary victim of the case) and Jacqueline de Bellefort's accomplice.


  • In the 1978 film adpatation, he was portrayed by the late Simon MacCorkindale.
  • In the 2004 adapation included in ITV's series, Agatha Christie's Poirot, he was portrayed by JJ Feild, who later portrayed the culprit of The Pale Horse in Agatha Christie's Marple.
  • In the upcoming 2021 film adaptation, he will be portrayed by Armie Hammer, who also voiced Jackson Storm in Cars 3 and Steve Lift in Sorry to Bother You.



Simon Doyle was the ex-lover of Jacqueline de Bellefort and was later married to the latter's former best friend, Linnet Doyle, after she stole him from Jacqueline. Nevertheless, Simon was revealed to be still in love with Jacqueline and hated Linnet for parting them. As a result, Simon joined Jacqueline's vengeful scheme to kill off Linnet and steal her fortune, first through staging their break-up and then through murder attempts.


On the night of the murder, Jacqueline's shot deliberately missed Simon, who faked his injury with red ink. While everyone in the lounge was distracted by Jacqueline, he took her gun that she had deliberately discarded, went to Linnet's cabin, and shot her. He then returned to the lounge and shot his own leg, to give himself a genuine injury.

However, his action was witnessed by Louise Bourget, the maid of Linnet, who used it to blackmail Simon. Louise's action soon got herself killed by Jacqueline, an act witnessed by Mrs. Otterbourne who was murdered again by Jacqueline before she could warn Poirot.


At the climax of the story, Poirot stayed alone with Simon and revealed what led him to his theory: the ink was contained in a bottle of nail polish he noticed in Linnet's cabin. Simon reloaded the gun with two spare cartridges before he disposed of it, as Poirot realized that three shots were fired that night; the stole was used to silence the gun when Simon shot his own leg.

Poirot suspected premeditation for the murder, because he slept deeply through that night's events – he had been drugged through his wine that evening. After the revealtion, both Simon and Jacqueline admitted their deeds.

The next day, as the cruise reached Cairo, Jacqueline shoots Simon and herself dead with another gun she possessed, so they may escape the gallows. Poirot knew Jacqueline had a second gun all along, but allowed her to commit murder-suicide out of sympathy towards them.


  • Since Jacqueline killed Simon before her suicide, Simon is the novel's fourth and final victim.


Agatha Christie's Poirot (title card).png Villains

Alfred Inglethorp | Alistair Ravenscroft | Ann Shapland | Anne Meredith | Bella Tanios | Claude Darrell | David Hunter | Dorothea Jarrow | Dr. Geoffrey Roberts | Dr. James Sheppard | Elsa Greer | Evelyn Howard | Franklin Clarke | Gerda Christow | Jacqueline de Bellefort | Jane Wilkinson | Jessie Hopkins | Lady Westholme | Lanfranco Cassetti | Marthe Daubreuil | Martin Alistair Blunt | Michael Garfield | Miss Chadwick | Miss Gilchrist | Nick Buckley | Nigel Chapman | Norman Gale | Patrick Redfern | Rowena Drake | Simon Doyle | Sir Charles Cartwright | Stephen Norton | Superintendent Sugden
Short Stories
Marrascaud | Nurse Harris | Roger Havering | Zoe Havering

Villainous Victims
Abandoned Accomplices
Anne Morisot | Carlotta Adams | Eileen Corrigan | Leslie Ferrier
Lady Boynton | Lord Edgware | Simeon Lee
Angèle Blanche | Charles Trenton | Henry Reedburn | Leopold Reynolds | Louise Bourget | Madame Giselle
Lanfranco Cassetti | Mrs. Lorrimer | Paul Déroulard | Stephen Norton
John Christow | Linnet Doyle | Mrs. Clapperton | Paul Renauld | Sir Reuben Astwell

Accomplices & Others
Alice Cunningham | Anne Morisot | Big Four | Carlotta Adams | Christine Redfern | Countess Vera Rosakoff | The Crofts | Eileen Corrigan | Frances Cloade | Freddie Rice's husband | George Challenger | Henrietta Savernake | Leslie Ferrier | Madame Daubreuil | Miss Van Schuyler | Rowley Cloade

Sophie Hannah's Continuations
The Monogram Murders (2014): Jennie Hobbs | Nancy Ducane | Samuel Kidd

Adaptational, Homage & Non-Canonical
Agatha Christie's Poirot: Grace Springer | Harrington Pace | Marie McDermott | Sister Agnieszka |

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