LOS ANGELES (CNS) - R&B singer Chris Brown today admitted violating his probation as a result of a Washington, D.C., arrest and was ordered by a Los Angeles judge to serve a year in county jail but given credit for 234 days already served.

Superior Court Judge James R. Brandlin also reinstated Brown's probation and extended it through January 2015.

The 24-year-old singer admitted violating his probation stemming from his 2009 assault of then-girlfriend Rihanna.

Brown was arrested March 14 after he was tossed out of a Malibu substance-abuse and anger-management facility, where he had been for about four months. Brandlin previously said the singer made troubling remarks during a group therapy session, discussing his use of guns and knives.

The singer is accused in Washington, D.C., of punching a 20-year-old man who was trying to get a photo with him. He had been transferred to Washington, D.C., earlier this month, but proceedings in that case were delayed, prompting his return to Los Angeles.

Brown pleaded guilty in June 2009 to assault by means likely to produce great bodily injury for assaulting Rihanna during an argument that began about 12:30 a.m.Feb. 8, 2009, while the singers were in a rented Lamborghini in  HancockPark after attending a pre-Grammy Awards party.

Brown was sentenced to five years probation, a yearlong domestic violence program -- which he completed -- and 180 days of community labor.

Brown's probation was first revoked last summer after he was charged with a pair of misdemeanors and an infraction stemming from a May 21 traffic crash in TolucaLake. Those charges have since been dismissed, despite a city prosecutor's objection to a “civil compromise” in which attorneys said no money was exchanged between the parties.

His probation was reinstated last August, when Brandlin ordered the singer to perform an additional 1,000 hours of community labor.