Dwyer was sentenced to 18 months of probation and community service following the plea, according to a court spokesman.
The 25-year-old Dwyer was arrested Sept. 17 for a July 21 incident in which he allegedly head-butted his wife in the face and broke her nose after she refused his sexual advances and bit his lip, according to reports taken at the time.
Dwyer's wife told police she reported the incident in September because she feared for their child's safety after seeing reports of Vikings running back Adrian Peterson's arrest on child-abuse charges.
The Cardinals placed Dwyer on the reserve/non-football injury list after his September arrest. He did not play again during the 2014 season.
Investigators believe Dwyer broke his wife's nose, punched her the following day and threw a shoe at his 1-year-old son. He was arrested in September and placed on the reserve/non-football illness list.
Barring a suspension from commissioner Roger Goodell, the Dwyer is eligible to play as early as the 2015 season.
Dwyer appeared at an arraignment hearing Monday in Phoenix. He is being charged with felony aggravated assault and eight misdemeanors.
Investigators say Dwyer broke his wife's nose during a July 21 argument. He then engaged in another dispute July 22 in which he punched his wife and threw a shoe at his 17-month-old son, who wasn't injured.
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