A secondary school teacher was found dead in a reservoir in Tuen Mun yesterday, the day after his wife reported him missing. Chan Yun-kei, 41, was found in Wong Nai Tun service reservoir in Tai Lam Country Park at about 9.25am. Police said he had been dead for more than 24 hours and there were no apparent wounds. 'We are investigating whether the victim slipped while taking a rest,' a police officer said. Chan had left his Ngau Tau Kok home on Sunday.