On 22 July 2010, Conservative MP Anna Soubry led a debate on adult mental health services and the case of John McGrath.
In July 2009, John McGrath was stabbed to death by his mentally ill grandson William Barnard.
Mr Barnard's grandmother, Mable McGrath, was also badly injured in the attack at the elderly couple's home.
The Nottinghamshire Healthcare NHS Trust commissioned a report on the care Mr Barnard was given which said there was "a disregard as to the significance of risk factors relating to [his] deteriorating condition" and that his care "fell below acceptable standards".
Mr Barnard had been treated for a serious mental illness but he had stopped taking his medication and was not placed in a secure mental health unit.
Ms Soubry told MPs that "Lessons have to be learned... across and around the country" from the case.
For instance, the MP for Broxtowe argued, families needed "to be far more involved in the care of people like Will".
She also drew attention to powers introduced by the previous government enabling mental health workers to enter homes and "make sure that when someone should be taking their medication doesn't take their medication... they can be put back into hospital".
Ms Soubry urged ministers to ensure that "everybody involved in mental health is aware of these powers and is willing to use them".