The International Federation of Journalists has published a report, "Targeting and Tragedy", on journalists killed in 2005. Steven Vincent's case is discussed on p.34, in Part Two of the report. A word of caution: the passage includes a photo of Steven's body.
According to Aidan White, general secretary of the IFJ, “In more than 90 per cent of all cases there are few serious investigations by the authorities and only a handful of the killers are ever brought to trial. A combination of police corruption, judicial incompetence and political indifference has created a culture of neglect and indifference which makes every day hunting season for attacks on media staff.”