article_snippet: Derek Jackson, 52, who was found dead in the man Biddeston home, had a history of criminal behaviour and mental health issues .
article_snippet: A grandfather whose body was found alongside his slain seven-year-old grandson and heavily pregnant daughter in a suspected murder-suicide, was well known to police and had a long history of mental illness.
article_snippet: Jackson's body was found in a bed . '
article_snippet: I must stress that we are in the early stages of we investigation however Jackson's body would appear that two of the deaths are suspicious and the death of Mr Sharpley is non suspicious,' Detective Inspector David Isherwood said.
article_snippet: Detective Inspector David Isherwood said there were no signs of physical injury on Jackson's body and that police were awaiting further results before making any conclusions about how Mr Sharpley died. '
article_snippet: There are a couple of issues, a couple of issues [forensic pathologists] think, with the decomposition.
article_snippet: Detectives have been unable to determine Jackson's (pictured) cause of death after preliminary pathology results returned inconclusive.
highlights_snippet: seven year old son were found dead on Monday .
  
highlights_snippet: Police say the deaths of the boy and mother are suspicious but the death of the man is not suspicious .