A special version of classic Christmas track, 'The Fairytale of New York' will be released exclusively through iTunes tomorrow (Tuesday December 20).

The download-only version features Shane McGowan and guest singer, Katie Melua, who takes the singing role originally filled by Kirsty MacColl, who was killed by a power boat while scuba diving with her sons in a restricted diving area off Cozumel, Mexico on December 18, 2000.

The track was originally released in 1987, when it reached number two in the UK Christmas charts. The original record is also being re-released in 7-inch, CD and DVD formats. The re-release date was chosen to coincide with the fifth anniversary of MacColl's death.

It's a recording of a special session made for the Jonathan Ross show which will be broadcast on December 22.

Justice for Kirsty!

The band is splitting the royalties from this release between homeless charity, Crisis at Christmas and the Justice For Kirsty Campaign.

Run by MacColl's mother, the Justice For Kirsty Campaign is attempting to force Mexican law enforcement authorities to bring the singer's killer to justice.

Four years after the singer's death, Mexico has still not made the killer accountable to the satisfaction of her family and friends.

MacColl's mum is demanding that the owner of the power boat, one Guillermo Gonzalez Nova, who was on board the boat at the time, be brought before the court to answer questions.

Nova is one of Mexico's most prominent businessmen: "I am not asking for any money. I just want him to stand up and speak the truth," she said.

A second download-only release of the track features a live performance in Brixton in 2001. This will be available from "all good online retailers," according to The Pogues website.