NFL Network's Tom Pelissero reported Monday that Childress will retire and that "it doesn't sound like (head coach) Andy Reid will be able to talk him out of it."
Childress has spent the past five seasons with the Chiefs after serving as an offensive coordinator with the Cleveland Browns in 2012. The 61-year-old is perhaps best known for his uneven head coaching stint with the Minnesota Vikings from 2006 to midway through the 2010 season.
With Brett Favre at quarterback, Childress coached the Vikings to the NFC championship game in 2009.
From 1999 to 2005, Childress acted as Reid's quarterbacks coach (1999-2001) and offensive coordinator (2002-2005) for the Philadelphia Eagles.