Paranoid, competitive and fuelled by guns, alcohol and steroids. That is how one senior contractor in Baghdad describes the private security industry operating in the city's Green Zone. It was the world to which Danny Fitzsimons, a 29-year-old former soldier suffering from post-traumatic stress disorder and paranoia, and with an extensive criminal past, returned three weeks ago. Despite rules against alcohol, his ArmorGroup colleagues welcomed him with a drinking session. A fight broke out and he shot and killed two of them - a Briton, Paul McGuigan, and an Australian, Darren Hoare - then wounded an Iraqi, Arkhan Mahdi. He faces a premeditated murder charge and execution if found guilty. Mr Fitzsimons's family is determined to save him and say he was suffering from severe psychiatric problems after a brutal career in the Army and in the security industry. But those on the ground hold little hope. They are already resigned to Mr Fitzsimons's execution and say that he is a tiny pawn in a huge, expensive and vicious game of chess. They say the private security business in Iraq is in a vice-like crush. The gold rush that began with the conflict in 2003 is drying up. Contracts are not as lucrative, the trend is towards employing Iraqis instead of Westerners and, crucially, the Iraqi authorities ... are clamping down. We are loathed out here. We are the single most hated entity in Iraq," said Ethan Madison, a security contractor who has worked in Baghdad for five years.