The Pittsburgh Steelers were seconds from strengthening their spot atop the AFC.
With one pass, the Steelers fell all the way to third in their division.
The Baltimore Ravens swept the season series from their rivals with a dramatic 23-20 victory on Sunday night, winning the game on a 26-yard touchdown pass from Joe Flacco to Torrey Smith with 8 seconds remaining.
The play put a stunning end to Pittsburgh's four-game winning streak and dropped the Steelers (6-3) to third in the AFC North behind the Ravens and surprising Cincinnati. Pittsburgh plays at the Bengals next week.
Coach Mike Tomlin took the blame, saying his hesitation calling for a late field goal attempt led to a penalty that forced the Steelers to punt, giving the Ravens one last shot.