"After a lot of consideration and discussion after the season, I determined that a change at offensive coordinator ultimately would be best for our team," Broncos coach Vic Fangio said in a statement announcing Scangarello's firing. "We need to do everything we can to get better -- in all areas -- as we start working toward next year.
"Rich is a bright coach with a great future ahead of him. I appreciate all of his hard work and thank him for his contributions to the Broncos."
Scangarello, 47, joined Fangio's staff in 2019 after two seasons as San Francisco 49ers quarterbacks coach under Kyle Shanahan.
With Lock under center for their last five games, the Broncos enjoyed some of their most impressive offensive games of the season and won four of their final five contests. But it was not enough to save Scang's job.
In all, the Broncos averaged 298.6 yards per games (28th), 5.0 yards per play (26th), 17.6 points per game (28th) and 17.4 first downs per game (29th), ranking near the bottom of the league in most offensive categories.
Shurmur, a two-time head coach and veteran offensive coordinator, will be tasked with turning those stats around. Shurmur's Giants fared mildly better than Denver in most offensive categories -- 338.5 YPG, 5.4 YPP, 21.3 PPG -- playing most of their games with a rookie quarterback, as well, in Daniel Jones.