It is Black Monday in the NFL as seven coaches have already been fired, or are expected to be fired at some point today (via ESPN.com).

Andy Reid of the Eagles was the longest-tenured of the group, having spent 14 seasons with the Eagles. With his dismissal, Bill Belichick (13 seasons) and Marvin Lewis (10 seasons) are now the longest-tenured coaches with their current teams entering the 2013 season.

In all, only 9 coaches have been with their current team for at least five seasons and more than half of the teams (17 of 32) have hired a new head coach since the end of the 2010 season. The average tenure is now just 3.2 seasons...

Data via Pro-Football-Reference.com