Free agent wide receiver Koren Robinson owes $497,502 in back taxes to the state of North Carolina. The nearly half million dollar tax bill makes Robinson the state's third-worst tax delinquent, Jim Morrill of the Charlotte Observer reports. The top two both owe over $1 million dollars. Robinson signed a $10 million dollar contract with the Seattle Seahawks, who chose the former North Carolina State star with the ninth overall pick of the 2001 NFL Draft. Robinson last played in the NFL in 2008, when he earned $664,118 in base salary in his second stint with the Seahawks.