The last episode of the David Suchet-starring Poirot, Curtain: Poirot's Final Case, will air on ITV1 tonight, Wednesday, at 8:00pm – but the actor could come back as the sleuth on the big screen.
The Press Association reports that Suchet said of his final show: "I tell you exactly what it feels like. You suddenly realise, although you never knew it, that you've reached Everest."
He continued: "And having suddenly stood on the top of Everest, that you never expected to climb, there is a complete strange mixture of, 'Oh, I now have to say goodbye because I've done it', and then euphoria, for the same reason - 'I've done it'."
Suchet, who is keeping many of his Poirot props, said that his last day filming was "one of the hardest days of my whole acting career".
"Not a pleasant thing to do," he said. "And that's not me being theatrical. I've lived with this man for 25 years and so it's difficult to say goodbye to a dear, dear friend, who's been part of my life for a quarter of a century."
While author Sophie Hannah is set to write a new Poirot book, Suchet said he did not think he would reprise his role on TV, but gave fans some hope that they would see him again.
He said: "I don't see how I can revive myself for a story that is not Agatha Christie. However, I'd love to do a remake of one of the stories for [a] movie.
"I would love to do The ABC Murders, which is my favourite. There's nothing to stop me reprising the story for cinema, because I've never done a cinema Poirot."