The killing of Fern Holland, a human rights worker from Oklahoma, remains unsolved and as mysterious as it was when her body was found riddled with bullets on a desolate stretch of road near one of Iraq’s southern holy cities in March 2004. Now, federal investigators are grappling with a second mystery: what happened to hundreds of thousands of dollars in cash issued by American authorities to Ms. Holland and Robert J. Zangas, a press officer who died in the same attack near Karbala, in the days before their deaths? Full Story