Lions' Calvin Johnson: Officially retires

Johnson filed retirement papers Tuesday and officially announced his retirement from the NFL.

Johnson was said to be leaning strongly in this direction, but the Lions held out some hope that they could coax another year out of him. Despite dealing with constant nagging injuries over the past few seasons, Johnson finishes his nine-year career with 731 receptions for 11,619 yards and 83 touchdowns, having missed just nine games along the way. He averaged at least 70 receiving yards per game in every year besides his rookie campaign, most notably setting an NFL single-season record with his 1,964 yards in 2012. There will probably be comeback rumors at some point in the next few years, as Johnson turns 31 in September and just posted a 88-1,214-9 receiving line in 2015.