He wrote for Sports Illustrated from 1989 to 2018, including the weekly multiple-page column Monday Morning Quarterback.
King joined the lineup of Bob Costas, Cris Collinsworth, Sterling Sharpe and Jerome Bettis, serving as a special "insider" reporter and analyst for the show, highlighting major topics from that day.
From the 2008 offseason until the fall of 2011, King co-hosted The Opening Drive on Sirius NFL Radio with Randy Cross and Bob Papa.
He has been a regular contributor to Chris Russo's Sirius XM show, Mad Dog Unleashed, since 2008.
In 2005 the governor of New Jersey appointed King to a fact-finding task force in an attempt to end steroid and human growth hormone use in high-school athletics.