The Bears have fired offensive coordinator Mark Helfrich, a source confirmed to 670 The Score. The team also dismissed offensive line coach Harry Hiestand, tight ends coach Kevin Gilbride and assistant special teams coach Brock Olivo. Adam Hoge of WGN Radio and Adam Jahns of the Athletic first reported the news.
The shakeup comes after the Bears ranked 29th in scoring (17.5 points) and 29th in total offense (296.8 yards) this past season.
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Helfrich, 46, joined Nagy's staff in January 2018 after a four-year stint as Oregon's head coach. His role with the Bears included overseeing the offense and its preparation of the scheme, but Nagy always held play-calling duties.
Last week, Helfrich acknowledged the potential for staff changes.
"You're in this business, stuff happens," Helfrich said. "That's a possibility."
Hiestand, 61, was Nagy's first staff hire in 2018. He had previously worked for six seasons at Notre Dame and also had spent five seasons on Lovie Smith's staff with the Bears from 2005-'09.
Gilbride, 40, also joined the Bears in 2018 after working four seasons as the Giants tight ends coach. Olivo, 43, was the Broncos' special teams coordinator in 2017 before arriving with the Bears a year later.