A retired watchman who hacked another pensioner to death will die behind bars after he was yesterday sentenced to life in prison for the killing. In passing the sentence on Hui Mak-kwan, 78, Mrs Justice Verina Bokhary said she feared for the public's safety after medical reports found Hui suffered from violent outbursts and could not be cured through counselling. She handed down a minimum jail term of 30 years. Hui had pleaded guilty to manslaughter on the basis of diminished responsibility. Defence counsel Peter Cahill had told the Court of First Instance that a psychiatrist found his client suffered from violent delusions and had difficulty controlling his impulses. Mr Cahill also said the case was extremely 'sad and tragic' and that a life term was equivalent to a death sentence. Mrs Justice Bokhary said she could not order Hui to be detained at a psychiatric hospital because two government doctors found he was not sufficiently disturbed. The court heard that when Hui left his Lower Wong Tai Sin Estate flat with a chopper on July 23 last year, he planned to fight a heroin pusher who lived on the 14th floor of the same block. Instead, he approached another man he did not know, Leung Kwok-keung, 50, who was sitting on the ground reading a newspaper. Hui chopped him twice on the head and once on each of his legs, while yelling 'chop you to death'. The court heard that despite his injuries, Leung ran to a flowerbed outside the Faith Hope Nursery, near where about six elderly people were sitting. Leung called out for help before collapsing and losing consciousness. Shortly afterwards, Hui arrived near the flowerbed and walked up to one of the elderly witnesses, Chan Choi-keung, 73, who was still sitting down. Hui then attacked Chan, who fell into the flowerbed and yelled for help. After briefly walking away, Hui attacked Chan twice more before witnesses stopped him. Chan was taken to Queen Elizabeth Hospital but was certified dead soon after arriving. The court heard that he died from multiple cuts, most significantly to his face and skull. It also heard that the blows were executed with such ferocity, muscles were severed and fragments of bone chopped off. Chan also sustained wounds to his arms, hands, thighs, ankles and toes.