Interim coach Tim Brewster, a longtime assistant at various levels, became the Niners’ associate head coach before this season under Biff Poggi, who was fired Monday by athletic director Mike Hill — before the conclusion of his second year at the helm.

After a 55-24 win over in-statement rival East Carolina Oct. 5, the 49ers have lost four in a row, with three of them coming by at least 30 points.

Following a fourth 30-point loss this season — on the program’s homecoming Saturday — Charlotte cut ties with Poggi. The former Michigan assistant posted a 6-16 record with the 49ers. Here’s what we know.