IOWA CITY, Iowa — A decade after Colorado engineer Amir Massihzadeh hit the lottery, two state agents visited him with stunning news: He was likely the only legitimate winner of a $4.8 million jackpot he'd had to split three ways. They told the Boulder resident that the other two people who had won the 2005 drawing were linked to a conspiracy in which a lottery insider and several cohorts had rigged drawings in several states.