The partner of Gillian Astbury, who died after slipping into a diabetic coma at the scandal-hit Stafford Hospital in 2007, told ITV News the criminal investigation into her death "has been a long-time coming".
Ron Street said what happened at the hospital was due to "several years of complacent mismanagement":
Campaign group Cure the NHS has commented on the news that the Health and Safety Executive has launched a criminal investigation into the death of a woman at scandal-hit Stafford Hospital.
In a statement issued by the Mid Staffordshire NHS Foundation Trust, its director of quality and patient experience, Julie Hendry, said:
"I would like to offer our sincere condolences to the family of Gillian Astbury for their sad loss and apologise for the appalling care Ms Astbury received at our hospital in April 2007.
"Ms Astbury's death was reported as a serious untoward incident at the time and a full investigation into her care and treatment was carried out. The recommendations from that investigation were implemented.
"Actions included raising staff awareness about the care of diabetic patients and improving the information and system for nurse handovers."
Ms Hendry added: "In 2010 we reviewed Ms Astbury's dreadful care and, as a result, disciplinary action was taken."We will, of course, co-operate fully with the Health and Safety Executive's investigation."
An Health and Safety Executive (HSE) spokesman said:
The report by Mr Francis highlighted "appalling and unnecessary suffering of hundreds of people" at the Trust between 2005 and 2009.
As many as 1,200 patients may have died needlessly after they were "routinely neglected" at the hospital.
Many were left lying in their own urine and excrement for days, forced to drink water from vases or given the wrong medication.
An inquest into her death found that failure to administer insulin amounted to a gross failure to provide basic care.
A criminal investigation has begun into the death of a woman at scandal-hit Stafford Hospital, the Health and Safety Executive (HSE) said today.
Gillian Astbury died after slipping into a diabetic coma at the hospital in 2007.
An inquest into her death found that the failure to administer insulin to the 66-year-old amounted to a gross failure to provide basic care.