He played for the Minnesota Vikings, Pittsburgh Steelers, Jacksonville Jaguars, and Kansas City Chiefs.

[1] He is currently the head football coach at Heritage High School in Wake Forest, North Carolina.

After high school Washington attended North Carolina State, grabbing 3 interceptions his junior year.

As a senior, Washington led the team with 4 interceptions, and also recorded 66 tackles (51 solo) as a co-captain.

The Vikings won the NFC Central Division with a 10–6 record, but lost in the first round of the 1994 NFL playoffs.

On February 25, 1998, the Pittsburgh Steelers signed Dewayne Washington as an unrestricted free agent.

On February 27, 2004, the Pittsburgh Steelers officially cut Dewayne Washington, making him a free agent eligible to sign with any team.

In training camp before the 2005 NFL season, the Kansas City Chiefs signed Washington to a one-year contract.

On May 11, 2015, Dewayne was introduced as the new head football coach at Heritage High School in Wake Forest, North Carolina making his head coaching debut on August 21, 2015, against Green Hope High School.

In January 2018, he resigned from the position, wishing to spend more time focusing on his business and family.

Currently, Dewayne lives in Raleigh, North Carolina with his wife, NC State graduate Adama Washington, and their three children.