Kansas City Chiefs defensive coordinator Steve Spagnuolo signed a contract extension, the team announced on Wednesday.Terms of the deal were not announced for Spagnuolo, who joined the team as a defensive coordinator in 2019.Under Spagnuolo, the Chiefs have won three Super Bowl titles in five years. They added to their trophy case on Sunday with a 25-22 overtime victory against the San Francisco 49ers in Super Bowl LVIII in Las Vegas.