I just saw that he was hired when I was reading an article about the Chiefs trying to retain Dee Ford. I did a double-take when I saw who the new DC was. I knew a quick search would pull up a thread from here.
In Kansas City, Spagnuolo inherits one of the league's worst defenses statisically. The Chiefs finished 31st in yards per game (405.5) and passing YPG (273.4), 27th in rushing YPG (132.1) and 24th in points allowed per game (26.3) and 26th in Football Outsiders' Defensive DVOA.