In week two of the 2012 season, Fox was fined $30,000 for chiding the replacement officials. The Broncos would go on to win their last 11 games after a 2–3 start. In week 17 of the 2012 season, Fox won his 100th career game as an NFL head coach, including the playoffs, beating the Kansas City Chiefs 38–3. However, the Broncos were upset in the divisional playoffs to the Baltimore Ravens, in double-overtime. Owing to a cardiac-related issue, starting with week 10 of 2013, Fox was replaced by Broncos defensive coordinator Jack Del Rio as Fox underwent an aortic valve replacement. Fox, while playing golf in North Carolina near his offseason home in Charlotte during the Broncos bye week, reported feeling dizzy and was taken for examination to the hospital, where doctors told him not to put off valve replacement surgery any longer; he had done so earlier in the year to continue coaching this season. On November 4, Fox temporarily relinquished his head coaching duties, and Del Rio was named interim head coach for the remainder of the 2013 season regular season. Fox then underwent successful aortic valve replacement surgery. In the 2013 NFL season, quarterback Peyton Manning threw for 5,477 yards and 55 touchdowns, both records, and the offense combined for 7,317 yards, also a record. Fox coached the Broncos to Super Bowl XLVIII, where they played the NFC champion Seattle Seahawks. He is one of four head coaches to win both an NFC and an AFC championship game along with Bill Parcells, Dan Reeves, and Andy Reid, and one of seven coaches to reach the Super Bowl with multiple teams. On February 2, 2014, the Broncos lost to the Seahawks 43–8. Fox coached the Broncos to another strong season in 2014; the Broncos finished the regular season 12–4. They earned the AFC's number 2 seed and a first-round playoff bye. Hosting Peyton Manning's former team, the Indianapolis Colts at home in the Divisional Round, the Broncos were upset 24–13 and were eliminated from the playoffs. On January 12, 2015, the day after Denver lost in the Divisional Round of the playoffs, Fox and the Broncos mutually agreed to part ways. Fox left the Broncos with the highest regular season win percentage in team history. However, general manager John Elway felt the Broncos hadn't shown enough fight at critical times in the playoffs. Fox is only the second head coach in NFL history to win four straight division titles since joining a new team; the Broncos made the playoffs in all four years of Fox's coaching tenure.