Walker currently covers sports during radio broadcasts in the Washington Metro Area. He hosts his own show on ESPN 980. He hosts a weekly television show called "Doc Walker's ProView," which airs Sunday mornings on ESPN 980 and Tuesday evenings at 11pm on MASN. In 2011, he moved into the color analyst’s seat for radio broadcasts of Redskins games on ESPN 980 after previously serving as the sideline reporter. As of 2019, he is currently once again the sideline reporter for Redskins radio broadcasts.
Previously he had been a co-host on The John Thompson Show and The Locker room with Doc Walker and Kevin Sheehan. He also appears in D.C. Lottery and BMW of Sterling commercials. He previously worked for Westwood One as a color commentator for college football broadcasts and a sideline reporter and occasional color commentator for the NFL on Westwood One. Up until the 2010 college football season, he was also the main color analyst for ACC football games for Raycom Sports with Steve Martin.