From a Wall Street Journal obit by Andrew Beaton headlined “Dick Butkus, Legendary NFL Linebacker, Dies at 80”:

Dick Butkus, the legendary Chicago Bears linebacker who instilled fear into offensive players with his powerful blows, has died.

In his nine NFL seasons ending in 1973, Butkus became the archetype of the middle linebacker position. He led the Bears’ defense, delivered ferocious hits and became an icon in the same town where he was born.