Here is a summary of the firings and personnel moves made on the Monday after the 2012 season ended, also known as Black Monday in the NFL:

Raiders fire OC Knapp, three assistants

The Raiders fired offensive coordinator Greg Knapp, special-teams coordinator Steve Hoffman, offensive line coach Frank Pollack and linebackers coach Johnny Holland, the team announced Monday. 

"Decisions like this are very difficult," head coach Dennis Allen said. "I have a great deal of respect for all of these men and I appreciate their contributions to the Oakland Raiders this season."

The Raiders finished with a 4-12 record in 2012 and the offense ranked 18th in the NFL. Knapp joined Oakland this past offseason after having success with the Texans the previous two seasons, but the run game struggled mightily in his zone-blocking system, finishing 28th in rushing yards per game.

Jets fire Tannenbaum, retain Ryan

Jets owner Woody Johnson announced Monday that GM Mike Tannenbaum will not return in 2013.

Tannenbaum took his post as the team’s GM in 2006 and was at the helm when the Jets went to back-to-back AFC championship games. Tannenbaum joined the team in 1997 as its director of player contract negotiations. 

In the team’s statement, Johnson said a search for a new GM will begin immediately, and that Jed Hughes of Korn/Ferry will lead the process.

The Jets have disappointed the past two seasons though, punctuated by a 6-10 mark in 2012. Johnson said in a statement, though, that head coach Rex Ryan will remain for 2013.

“Rex Ryan will remain the Head Coach of our football team. I believe that he has the passion, the talent, and the drive to successfully lead our team,” Johnson said.

Tannenbaum released the following statement: 

"I want to thank Woody and his entire family for giving me the opportunity of a lifetime -- serving as the General Manager of the New York Jets for seven years.