A MAN released from prison just three days ago was found dead on the staircase of a Kwun Tong building last night. Chau Man-sang, 45, had served two years and three months for drug offences and theft. His chest was severely bruised, possibly as a result of a beating. Chau's 77-year-old father and his two brothers said he had returned to their Lam Tin home after being released, but had left after two days. A resident of a building in Shung Yan Street saw Chau lying face down on a mattress on a staircase at 10 pm on Wednesday night and assumed he was asleep. But when he walked past again at 7 pm last night Chau was still there and he called police.