Killebrew suffered a serious knee injury on a Browns kickoff in Week 6, leaving the field on a cart after planting hard on his right leg. The Steelers announced he’ll miss the rest of the game, a blow to a veteran special-teams captain who has earned Pro Bowl honors in each of the past two seasons. With him out, Pittsburgh must lean on Peppers and a practice-squad pool to shoulder heavy ST duties, testing depth as the season advances. This setback heightens the urgency to stabilize kickoff and punt coverage against upcoming opponents and could shift fantasy return-room dynamics.