After spending days in critical condition, Brenda Cooper, 66, succumbed to injuries she sustained on July 16, officials said.

Assisted living centers are rare in Mass, but many families still don’t know what they offer — or what they don’t.

The Massachusetts assisted-living facility where a fatal fire killed nine people was caring for dozens of aging residents reliant on wheelchairs and oxygen tanks, but it lacked the safety measures and most of the staffing requirements that are commonplace in nursing homes.

A former employee said she never saw the staff perform fire drills. The local fire chief pushed back at claims that dispatching more firefighters would’ve saved more lives.

While an investigation continues into the cause of a Massachusetts assisted living community fire that killed 10 residents and injured 30, calls are growing in that state — and nationally — for federal oversight of the sector.

Nine people died and dozens were hurt in a fire at the Gabriel House Assisted Living Facility, and finger-pointing has already begun over whether there were enough firefighters to respond and whether staff at the facility did enough to help.

Video from police body cameras shows officers entering the building during the fire and assisting with the rescues of residents. (The Fall River Police Department edited this footage.)