Arizona Cardinals running back Jonathan Dwyer pleaded guilty to disorderly conduct Thursday and was sentenced to 18 months of probation and community service in a domestic assault case.

The punishment, handed down in Maricopa County (Ariz.) Superior Court, is the result of a case in which Dwyer allegedly assaulted his wife last July.

Dwyer, 25, had pleaded not guilty Monday to charges of felony aggravated assault and criminal damage for allegedly head-butting his wife and breaking her nose July 21. But he pleaded guilty to a lesser charge Thursday and the felony counts were dismissed.

Dwyer was arrested Sept. 17 and the Cardinals placed him on the reserve/non-football illness list. Dwyer will be a free agent in March.