McElwain's buyout was $12.9 million, but ESPN reported Saturday that Florida officials were looking into whether McElwain could be fired for cause.
Last Monday, during his regular weekly news conference, McElwain claimed he had received death threats when asked a question about whether his team was receiving enough credit.
5pm (ET) update Florida has now officially announced they are parting ways with Jim McElwain and that Randy Shannon will serve as interim head coach for the remainder of the season. Florida was eliminated from contention in the Eastern Division with a 42-7 loss to rival Georgia on Saturday. The Gators made back-to-back appearances in the SEC Championship Game but the Gators never seemed to develop offensively under McElwain's run.
The Gators were 22-12 during McElwain's tenure as head coach.
Stricklin met with McElwain later that day, and the coach rebuffed a request to provide more information about the threats. Look, we haven't been good on offense. That's real. That's life. While his teams won a lot of games, McElwain's time with Florida will best be remembered for his struggling offense. The 45-year-old Mullen was Florida's offensive coordinator under Urban Meyer and worked for Stricklin in Starkville, Mississippi.
He became Florida's defensive coordinator following the departure of former defensive coordinator Geoff Collins, who left Gainesville to become the head coach at Temple before Florida's Outback Bowl appearance in early 2017.
Possible candidates could include South Florida's Charlie Strong, Central Florida's Scott Frost, Iowa State's Matt Campbell, Memphis' Mike Norvell, SMU's Chad Morris and Syracuse's Dino Babers.