Hotel receptionist Baha Mousa, 26, was working at Basra's Ibn Al Haitham hotel in September 2003 when it was raided by British forces.
He and several colleagues were taken to the British military base at Darul Dhyafa, where Mr Mousa died whilst in custody.
He had suffered 93 separate injuries while he was detained, including fractured ribs and a broken nose.
Iraqi detainees who survived the detention said they endured humiliating mistreatment and brutality, including interrogation techniques specifically outlawed by the British Government in 1972 such as: hooding and sleep deprivation.
The Iraq Historic Allegations Team (IHAT), set up to examine allegations British troops ill-treated and murdered Iraqi citizens, said that it will look at new lines of inquiry linked to the case.
In September 2011 a public inquiry led by Sir William Gage found Mr Mousa died after suffering "an appalling episode of serious gratuitous violence" which represented a "very serious breach of discipline" by members of 1st Battalion the Queen's Lancashire Regiment (1QLR).
In March last year, it was announced that IHAT should conduct a review of the Baha Mousa public inquiry report.
Head of IHAT Mark Warwick said: "We realise the news of another investigation so long after the event will be difficult for the victims, their families and the soldiers concerned. I would like to offer reassurance both IHAT and the SPA will do all we can to ensure the investigation proceeds quickly and efficiently."