Derrick Johnson rolled over and flipped his helmet off. He seemed to know his night was over.
On Thursday, with the Chiefs leading the Oakland Raiders 21-3 in the second quarter, Johnson, the Chiefs’ star inside linebacker, fell mid-play due to a non-contact injury.
He was later carried off the field and escorted to the locker room, where he was eventually ruled out for the rest of the game with a left Achilles injury.
Johnson ruptured his right Achilles in the 2014 season opener and missed the rest of the season.
With Johnson out, the Raiders proceeded to mount a 92-yard scoring drive that cut their halftime deficit to 11.
Johnson, a four-time Pro Bowler, leads the Chiefs in tackles with 89 on the season. Eric Berry, the next closest Chief, has 59.
More to come on this story as it develops.