Denver Broncos coach John Fox undergoes heart surgery

FILE - In this July 27, 2013, file photo, Denver Broncos defensive coordinator Jack Del Rio coaches players during NFL football training camp in Englewood, Colo. While Peyton Manning was off the charts in the first half of the season, Denver's defense went from dominant to dismal without Von Miller, Champ Bailey and Wesley Woodyard. Two of the three are back and so is Del Rio's smile (AP Photo/Jack Dempsey, File)
FILE - In this July 27, 2013, file photo, Denver Broncos defensive coordinator Jack Del Rio coaches players during NFL football training camp in Englewood, Colo. While Peyton Manning was off the charts in the first half of the season, Denver's defense went from dominant to dismal without Von Miller, Champ Bailey and Wesley Woodyard. Two of the three are back and so is Del Rio's smile (AP Photo/Jack Dempsey, File)
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