Ardal O’Hanlon will take on the lead role when 43-year-old Marshall departs, and he's very happy with how things have turned out.
In an interview with Radio Times, Marshall said: "Well, he’s Irish, for starters. So that makes a bit of a difference. His character’s a lot more anecdotal, so the way he goes about things is different. He’s also been recently widowed – and he has a daughter in her early 20s. So that’s a whole different dynamic.
“I gave Ardal the same advice that Ben [Miller] gave to me, actually. When you’re filming the big wrapping-up scene at the end, make sure you know your lines backwards. Because we film it all in one day and otherwise the heat starts to get to you."
The storyline will see Marshall's Detective Inspector Humphrey Goodman head back to the UK, after the actor decided to hang up his boots due to practicalities of spending six months each year 4,000 miles away filming in Guadeloupe.
Death in Paradise: Kris Marshall spills all on his replacement and admits regrets
Death in Paradise: Kris Marshall's Detective Inspector Humphrey Goodman returns to London
Some people think I’m mad, obviously. And there is an old adage, ‘Don’t quit a hit’, which is very true. I’m going to miss it terribly.
Marshall’s friends believe the actor is "mad" for giving up the role so easily, especially as it involves spending half of each year on a "paradise" beach.
“Some people think I’m mad, obviously. And there is an old adage, ‘Don’t quit a hit’, which is very true. I’m going to miss it terribly," he added to the publication.
"There have already been times when I’ve thought to myself, ‘Have I made the right decision?’”
Marshall has refused to reveal any specific details of his departure to avoid spoiling the show, but viewers already know that a murder inquiry has taken the detective to London.
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Death in Paradise: Kris Marshall as Detective Inspector Humphrey Goodman
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The latest issue of Radio Times is available now [RADIO TIMES]
In London, he will find himself working alongside O’Hanlon’s new character, with rumours of a potential romance that interferes and causes Humphrey to stay in the city.
“There are myriad reasons. Of which that may be one," Marshall said of his London exit.
Series one of Death in Paradise attracted an average of 5.8 million viewers, but Marshall has continued to pull in the viewers, with ratings for the first episode of this series pulling 9.2 million viewers when including iPlayer clicks.
The full interview can be seen in the latest issue of Radio Times, which is out now.
Death in Paradise continues this Thursday on BBC One at 9pm.