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Detectives are hoping to access badly burned parts of a north-western Sydney nursing home for the first time since a fire killed six residents.
Fire tore through the home, on Hambledon Road, Quakers Hill just before dawn on Friday.
The fire's latest victim, a 79-year-old woman, died in Liverpool Hospital yesterday morning and there are fears for several other elderly people who remain in hospital.
Roger Kingsley Dean, 35, a nurse who worked at the home, has been charged with four counts of murder and appeared at Parramatta Bail Court on Saturday.
Authorities still consider some fire-damaged areas of the building too dangerous to access, but there are hopes they will be made safe on Monday, allowing detectives to further investigate how the fire started.
"Police are still at the scene carrying out investigations," a police spokesman told AAP on Sunday night.
"There are still some issues regarding access and that's hampering efforts."
NSW Nurses Association general secretary, Brett Holmes, said the nursing profession was "deeply shocked" one of its own had been charged over the fire.
"The profession of nursing is deeply shocked that one of our own has been charged with murder in relation to this tragedy," Mr Holmes said in a statement.
NSW Premier Barry O'Farrell announced he had ordered a report on police checks for nursing home staff and nursing home building structures to be given to him on Monday.
"I've asked for a full report not only on checks on staff but also the physical structure of nursing homes and retirement villages across the state," Mr O'Farrell said.
Three of the residents who died after Friday's fire have been named as Alma Smith, 73, Lola Bennett, 86, and Ella Wood, 97.