A further four complaints that are unrelated to the current police probe have been made against the Pentland Hill Care Home in Edinburgh.
The home's owner, private healthcare provider Bupa, has admitted failings and said it has moved to address serious concerns raised after scrutiny by the Care Inspectorate.
The standards watchdog confirmed it is looking at the four separate complaints about quality of care which are unrelated to the police inquiry.
The inspectorate will disclose details of these complaints if they are upheld.
A spokesman for the inspectorate said on its scale of one to six, Pentland scored at most two. The average is four or five.
Police revealed in August that they are investigating the death of a 67-year-old resident at the home the previous month. A damning report by the watchdog also led to the suspension of new admissions to the home.
The Care Inspectorate had given the home a September 18 deadline to improve certain conditions.
Vivienne Birch, Director of Partnerships at Bupa Care Services, said yesterday: "We believe we are on track to deliver the improvements we agreed with the Care Inspectorate but we appreciate we are not yet at the level we want to reach.
"We have invested significant resources in improving the home.
"We will continue this work with support from the Care Inspectorate and other colleagues."