STAR TV has sacked its managing director after less than five months, making his successor the fourth managing director in 21/2 years. Industry sources said James Griffiths, 39, handpicked by STAR boss Rupert Murdoch last August for the job, was fired just before Christmas. The development was also reported by the Far East Economic Review, which quoted a business associate as saying that before leaving on holiday late last year, Mr Griffiths was ''told not to come back to Hong Kong''. Mr Griffiths refused to comment when the magazine contacted him in the United States. STAR TV also declined to deny or confirm the reports. ''These reports are speculative; however, we expect to be able to announce something about management restructuring tomorrow,'' a spokesman said last night. The Review quoted broadcasting industry executives as saying the management shake-up reflected internal politics within News Corporation, which owns 63.6 per cent of STAR.