Former heavyweight champion Mike Tyson walks out of Judge Helene Abrams' courtroom Monday at the Maricopa County Superior Court complex in Mesa, Ariz. Tyson pleaded guilty to charges of drug possession and driving under the influence stemming from a traffic stop last year as he was leaving a nightclub.

MESA, ARIZ. ? Former heavyweight champion Mike Tyson pleaded guilty Monday to charges of drug possession and driving under the influence stemming from a traffic stop last year as he was leaving a nightclub.

Tyson acknowledged to a judge that he had cocaine and was impaired when he was stopped for driving erratically in Scottsdale on Dec. 29.

He pleaded guilty to a single felony count of cocaine possession and a misdemeanor DUI count and faces up to four years and three months in prison when he is sentenced Nov. 19.