DENVER, CO - AUGUST 20: Linebacker D.J. Williams #55 of the Denver Broncos celebrates on the sidelines after making an interception during the second quarter against the Buffalo Bills at Sports Authority Field at Mile High on August 20, 2011 in Denver, Colorado. (Photo by Justin Edmonds/Getty Images)
Williams was punished for violating the league's policy and program for substances of abuse following his conviction in August of driving while ability impaired.
He already was serving a six-game suspension to start the season for violating the league's banned-substances policy after the NFL said he supplied a "non-human" urine sample during an offseason drug test.
Williams, the team's leading tackler in four of the last five seasons, won't be eligible to return to the Broncos until Nov. 12.
The Broncos were flying to New England for their game against the Patriots when the new suspension was handed down.
(Copyright 2012 The Associated Press. All rights reserved.)