Chris Brown's misdemeanour assault trial is facing a long delay after his bodyguard, a key witness for the defence, refused to testify unless he was granted immunity following his own conviction on Monday (21Apr14). Christopher Hollosy was found guilty of punching 20-year-old Parker Adams in the face during a bust-up outside a Washington, D.C. hotel in October (13). The security guard claims he was the only one to hit Adams, and insisted during his trial that he lashed out because the victim was attempting to gain access to his client's tour bus. Brown's trial relating to his involvement in the alleged assault began immediately after Hollosy was found guilty, but his lawyers were granted a continuance and the case was postponed until Wednesday (23Apr14). Proceedings have stalled again after prosecutors denied Hollosy's request for immunity over evidence he had been expected to give during Brown's trial, which the defence team had hoped would clear the star of any wrongdoing. Hollosy's lawyers have now revealed they plan to challenge the bodyguard's conviction and will not participate in Brown's trial until the appeal process is complete. The singer's attorney, Mark Geragos, believes this could take at least six months. Judge A. Franklin Burgess, Jr. set a date for a status hearing in Brown's case for 25 June (14) - the same day Hollosy is due to be sentenced - although a new trial date has yet to be determined. Brown, who has denied the assault charge, faces up to six months in jail and a $1,000 (£625) fine if convicted. He could land a further four years behind bars if the ruling is deemed a violation of his probation following his 2009 conviction for assaulting his then-girlfriend, Rihanna. Meanwhile, the incarcerated singer is waiting to hear if he will be allowed to walk free from jail - a California hearing regarding his release is due to take place on Wednesday afternoon. Brown has been behind bars since he was dismissed from a rehab facility in California, where he was receiving court-ordered anger-management treatment, last month (Mar14).