'Chicago' was where Darius' made his West End debut in 2005 when he became the youngest actor to take on the role of Billy Flynn.

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He made his first appearance in the role at the Adelphi Theatre on 21st November 2005 and his first run was a strictly limited 8-week season, but he was so popular he was asked to extend it for another month and ended up playing until 11th 

February 2006 and then returned to the show again, playing from 17th June to 8th July 2006. 

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Speaking to the The Mirror at the time of his casting he said:"I'm very excited, apparently I'm the youngest Billy Flynn ever which is a huge privilege." He also spoke to the Daily Record in February 2006 about being asked to stay on saying: 

"I was originally contracted until January and they asked me to stay for an extra four weeks.

"I've been very fortunate with the twists and turns that I've gone through in my life. I get a buzz out of every night, giving and learning a lot from other performers who have filled the show.

"I really feel a lot of respect for these people who are phenomenally fit and have real dedication."

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In December 2007 Darius was one of a host of big name stars who returned to the West End stage to celebrate the 10th Anniversary of 'Chicago' with a charity gala at the Cambridge Theatre.
He performed 'Razzle Dazzle' alongside other former Flynn actors Ian Kelsey and Terence Maynard. 

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He then reprised the role again on 7th November 2011 when he starred opposite Hollywood star America Ferrera at the Garrick theatre. ​

Crediting his friend and former Pop Idol judge Simon Cowell for persuading him to take on the role of Flynn Darius said in 2011:

"He’s the consummate businessman and a wonderful guy and there’s a lot of Simon Cowell in Billy Flynn in terms of the way he approaches things and I recognise that in terms of the character."

"I'm incredibly grateful for the experiences I've had and all the opportunities that it opened up and to be able to call Simon Cowell a friend and to be able to have dinner with him."

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Chicago is a 1975 American musical with music by John Kander, lyrics by Fred Ebb, and book by Ebb and Bob Fosse. The musical is based on a 1926 play of the same title by press reporter Maurine Dallas Watkins, about the criminals and the crimes on which she reported. The concept is a  satire on corruption in the administration of criminal justice and the concept of the "celebrity criminal".

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Set during the roaring “jazz hot” 20s, Chicago tells the story of two rival vaudevillian murderesses locked up in Cook County Jail. Nightclub star Velma’s serving time for killing her husband and sister after finding the two in bed together. Driven chorus girl Roxie’s been tossed in the joint for bumping off the lover she’s been cheating on her husband with. Not one to rest on her laurels, Velma enlists the help of prison matron Mama Morton and slickster lawyer Billy Flynn, who turn Velma’s incarceration into a murder-of-the-week media frenzy, thus preparing the world for a splashy showbiz comeback. But Roxie’s got some of her own tricks up her sleeve…

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Billy Flynn is one of the city of Chicago's most effective defence attorneys; he can win any trial and usually represents women who have murdered their lovers. He has never lost a case involving a female defendant in his whole career, but in turn charges high fees for his services, demands payment in full up-front, and never takes pro bono work. In rare cases, such as Roxie Hart's, he will take a discount rate in exchange for a cut of proceeds from selling ephemera and media rights fees related to the case. 

Most of Billy Flynn's clients actually did commit the murder they are accused of; therefore he usually attempts to conjure a defense of self-defence or insanity. He will often turn trials into a media circus and public spectacle, regularly manipulates witnesses to fit his narratives (which usually have no resemblance to the truth), and keeps a tabloid sob sister, Mary Sunshine, on retainer to ensure positive press coverage for his clients. He considers his profession to be akin to the entertainment industry, with himself as an A-list star in the field.

During the show Flynn sings three songs. "All I Care About (is Love)" serves as Flynn's jingle, in which the crooner claims not to care about wealth or materialism and works for his love of women (later revealed to be a complete lie), "They Both Reached For The Gun (The Press Conference Rag)" serves as a ventriloquist act with a call-and-response between Billy's "dummy" Roxie and the press, and "Razzle Dazzle" (a champagnesque piece with what Jerry Orbach described as "Brechtian subtlety" serves as the explanation of Flynn's modus operandi: make the case a distraction so that the jury loses attention.

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During his 2005 run in Chicago, Darius appeared on GM:TV with host Jenni Falconer to perform "They Both Reached For The Gun".
You can watch it below.