The Lions introduced their two new coordinators to season-ticket holders Monday night at Ford Field, but that didn’t mean the changes to the coaches staff were over.

Detroit lost another assistant coach Wednesday when special teams assistant Devin Fitzsimmons took a job with Vanderbilt University as its new special teams coordinator and tight ends coach, the Tennessean reported. The Lions have already removed Fitzsimmons’ bio from the team website.

Fitzsimmons handled the bulk of the special teams coordination in Detroit after Matt Patricia fired Joe Marciano halfway through their first year together. The special teams saw noticeable improvement after that move, particularly when it came to limiting penalties and long returns, and wound up landing longsnapper Don Muhlbach on the Pro Bowl team.

But rather than lift the interim tag with Fitzsimmons, the Lions decided to bring back an old friend. They hired John Bonamego fresh off his firing as the head coach at Central Michigan. Bonamego coordinated the Lions’ special teams from 2013-2014 and is back in the role now.

Fitzsimmons is one of several coaches who have departed from the Lions this offseason, joining offensive coordinator Jim Bob Cooter, quarterbacks coach George Godsey, running backs coach David Walker and offensive assistant Derius Swinton. Marciano was fired halfway through last season.

Most have been replaced, though Detroit does not currently list a running backs coach on its staff page.

The turnover comes after Patricia’s first season finished at 6-10 and in last place in the NFC North. Patricia waited until after the Super Bowl last year to make a majority of his new hires, so this offseason has given him some more time given that the Lions missed the playoffs.