A 35-year-old registered nurse charged over the Quakers Hill nursing home fire is set to appear in court charged with multiple counts of murder.
Roger Dean, who police said worked at the nursing home for a short time, is due to face Central Local Court in Sydney on Thursday charged with four counts of murder.
Dean is expected to face additional charges when he appears at court, a police spokesman said.
The court appearance comes a day after hundreds of mourners gathered at Quakers Hill's local Anglican church for a memorial service for the nine elderly victims.
Two fires are believed to have broken out in separate wings of the Quakers Hill nursing home in the early hours of Friday morning, police said.