The Lions signed wide receivers Marcus Robinson and Cliff Russell and re-signed cornerback Keith Smith on Wednesday. Robinson was cut by the Vikings with one game left last season despite leading the team with four touchdown receptions in 10 games. He started 19 of his 41 games over three seasons in Minnesota, catching 107 passes for 1,553 yards and 17 touchdowns. Robinson has 43 career touchdowns in nine seasons with the Bears, Ravens, and Vikings.