The Any Dream Will Do finalist, who lost out to the role of Joseph to Lee Mead in the popular BBC series, will begin touring in the lead role from July.
The Saturday night show was watched by millions, and although Keith Jack was unsuccessful, he was extremely popular with audiences and came in a close second.
Keith went on to play the Narrator in the UK tour of Joseph. He has also played Aladdin at the King's Theatre in Glasgow and Peter Pan at His Majesty's Theatre in Aberdeen.
Keith has released two albums. His debut was called This Time and went into the Top 40. His most recent album An Evening at the Musicals was released last year. Most recently he has been in New York recording the soundtrack for a film called The Dreams of Kings which will be entered at the New York Film Festival.
The UK tour of Joseph and the Amazing Technicolor Dreamcoat will begin in Bournemouth on July 20 and then tour the UK to regional theatres.