Neeltje Valkay, 90, was the latest person to die as a result of the blaze.
On Tuesday police said Doris Mercy Becke, 96, died overnight at Blacktown Hospital from complications from the fire.
On Monday, 82-year-old Ceasar Galea died at Hawkesbury Hospital, and Urbana Alipio, 79, died on Sunday in Liverpool Hospital.
Three residents, including 73-year-old Alma Smith, died at the scene of the fire, which tore through the home on Hambledon Road in Quakers Hill early on Friday morning.
On Friday afternoon Lola Bennett, 86, died at Royal North Shore Hospital, and on Saturday morning Ella Wood, 97, died at Concord Repatriation General Hospital.
Dean has been in custody since he appeared via video link at Parramatta Bail Court on Saturday.
He did not apply for bail and bail was formally refused.
- AAP