A Maricopa County Superior Court spokesman says Washington entered the plea yesterday.
Washington is charged with aggravated assault and criminal trespass. He has been free since he posted $2,400 bond after being arrested on May 3. Phoenix police have said Washington's ex-girlfriend claimed he grabbed her by the throat and shoved her to the ground following an argument at her apartment.
The TCU product led the Cardinals with 134 tackles – including 108 solo – last season and was named to the NFC Pro Bowl squad. He also paced the Red Birds in sacks with nine. He inked a six-year contract extension last September.
Washington was also suspended for the first four games of the 2013 NFL season for violating the NFL's substance abuse policy.
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