Estate administrators of the four people killed in the collapse of a To Kwa Wan tenement in 2010 have filed claims for compensation. In a High Court writ, the estates of Lo Kin-wa, 46; Li Qunzhen, 37; student Tong Qingtao, 20, and optician Choy Tao-keung, 40, are asking for unspecified damages. They claim the fatal accident on January 29, 2010, was caused by the negligence and breach of duties by Halesweet, owner of the 55-year-old building at 45J, Ma Tau Wai Road; principal tenant Cha Nam-yam, who sublet the flats; repairman Chu Wai-wing, and the Building Authority. Records show that Halesweet is a company used by Chak Oi-luen to hold the building. Chu was hired by Chak to tear down an external wall and an illegal structure on the ground floor of the tenement block on the day of the collapse. Chu is the only one facing criminal prosecution and has been charged under the Buildings Ordinance with carrying out work likely to cause injury to people and damage to property. He faces up to three years in prison and a HK$1 million fine. The trial is continuing. The administrators lodged their claims under the Law Amendment and Reform (Consolidation) Ordinance, the Fatal Accidents Ordinance and the common law. Their claim came after coroner Michael Chan Pik-kiu found in August 2011 that the four deaths were accidental. He was unable to find the deaths unlawful and said no one should be held criminally responsible. Chan agreed with two expert witnesses that Chu had played only a minor role, describing his action as the last straw. The coroner described Chak as "an unprofessional owner", who did not do her best to find a qualified person to do repairs, and who hoped officials would solve all her troubles for her. He also said both the owner and buildings officials had at least done something, though inadequate, to address the problems. The coroner suggested the department cancel the practice of sending flat owners a non-binding advisory letter before a statutory repair order, as the letter was usually ignored.