Keith Duffy has joined the cast of 'Celebrity Murder Mystery'.

Keith Duffy

Keith Duffy

The 45-year-old singer will be testing his detective skills as he is set to take part in Channel 5's new reality show next month which will see a group of stars play a classic 'whodunit' game and try to determine who among them is guilty.

The former Boyzone star will be joined by Rev. Richard Coles, Angela Rippon, John Sergeant, Sheila Ferguson and Su Pollard in the show's creepy country mansion.

Keith might have an advantage over his fellow cast members after appearing on crime drama 'Death In Paradise' in 2011.

Meanwhile, the 'No Matter What' hitmakers - who pulled the curtain on their 26-year career following five shows at the London Palladium last year - previously revealed the band weren't as "squeaky clean" as some people might think.

The group - which also featured Stephen Gately until his tragic death at the age of 33 in 2009 - have admitted they were more rock 'n' roll than most rock stars in their heyday.

Keith explained: "The perception of rock stars is that they're all about sex, drugs and rock 'n' roll, and a boyband is all pretty boys, who are squeaky clean. That was completely f***ing wrong. We were more honest.

"If you look at a rock band, they've got long hair that's permed -- how are they cooler than us? We had shaved heads and were in the bar until six o'clock in the morning."

Ronan, 42, agreed: "I'm sure you put a few rock stars to bed over the years and stayed up afterwards."