POLICE are investigating a murder and suicide case in which a 35-year-old man was killed and his father was found lying outside a block of flats on Cheung Sha Wan Estate. Police believe he jumped from the seventh floor. They later found his son, unconscious with chop wounds on his neck, lying in a seventh-floor flat. A bloodstained knife and a razor were found. They were taken to Caritas Medical Centre where they were certified dead.