He had beaten up his girlfriend and her injuries were so severe they could not be hidden by makeup. Rihanna's scheduled performance at the 2009 Grammy Awards was cancelled.
Following his arrest, several of Chris Brown's commercial ads were suspended, his music was withdrawn from multiple radio stations, and he withdrew from public appearances, including the 2009 Grammy Awards, where he was replaced by Justin Timberlake and Al Green. Brown hired a crisis management team to handle his new media image.
On June 22nd, 2009, Chris Brown pleaded guilty to felony assault and accepted a plea deal of community labor, five years' formal probation and domestic violence counseling.
Numerous organizations criticised the plea deal, advocating the punishment was not severe enough for the crime.
Chris Brown released a two-minute video on his official YouTube page apologizing to fans and Rihanna for the assault, expressing the incident as his "deepest regret" and saying that he has repeatedly apologized to Rihanna and "accepts full responsibility", but most people felt the apology was really only because the incident hurt his music career and not because of any real sympathy for the victim. The video has since been hidden and is no longer viewable by the public.
On August 25th 2009, Brown was sentenced to five years of probation, one year of domestic violence counseling, and six months of community service; the judge retained a five-year restraining order on Brown, which requires him to remain 50 yards away from Rihanna, 10 yards at public events.
On September 2nd, 2009, Brown spoke about the domestic violence case in a pre-recorded Larry King Live interview, accompanied by his mother and attorney Mark Geragos. Chris Brown's mother had been repeatedly assaulted by his stepfather.
Chris Brown claims he does not remember assaulting Rihanna and that the night was "a blur".
On March 22, 2011, after a contentious interview with Roberts on Good Morning America at the Times Square Studios, Brown became violent in his dressing room during a commercial break before his second performance ending that day's program, and threw an object at a window overlooking Times Square, smashing the window. Brown then took off his shirt and had several angry confrontations with the segment producer, other show staff and building security, and then left the building shirtless.
So yeah... that guy has anger issues.
But apparently this hasn't really hurt Chris Brown's career. Following his 2012 Grammy performance women were making all sorts of tweets about him.
The most disturbing of which is:
"he's hot he can beat me up any day he likes lol"
Seriously? Be careful what you wish for.