The father of a teenager found dead in a police cell is suing the Government for alleged negligence, which he claims resulted in his son's death two years ago. Li Ka-ming, 18, was detained at Sheung Shui police station on March 19, 1999 - seven months after he failed to appear in court for sentencing on a theft charge. He was found dead the following morning. The inquest jury heard he might have died of a drug overdose but returned an open verdict in September 1999. Lawyers for father Li Chun-yue filed a High Court writ on Thursday, naming the Secretary for Justice as the defendant on behalf of the Commissioner of Police. Mr Li is seeking unspecified damages, alleging his son's death was 'as a consequence of the negligence and/or breaches of statutory duty' of police. The boy pleaded guilty to stealing a mobile phone in August 1998 but failed to turn up for sentencing in October. He went to Beijing to visit his cancer-stricken grandfather, but surrendered to police on March 19, 1999, at the Lowu border crossing.