The suspected murder-suicide of a mother, 40, and two young children - a girl, 10, and boy, eight - is the latest in a disturbing list of similar tragedies that have shocked Australia in recent years.
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He said he felt the matter 'hasn't been looked into properly' and the fact that had yet to happen three years on 'I think that's pretty poor'.
'I think more action should've been done within the first year - looking into this situation and what happened and why it happened - to prevent this from ever happening again,' Mr Cockman said.
Western Australia's coroner Ros Fogliani ruled out a public inquest into the deaths stating it was unlikely to generate further evidence.
Peter Miles (second from left in suit and blue tie) shot dead his wife, Cynda, (back right), his daughter Katrina Miles (left in red dress) and her four children (pictured) before shooting himself