Brenda Cropper, 66, died at a hospital after being in critical condition all week after the fire erupted on Sunday, officials said.

Assisted living centers are rare in Mass, but many families still don’t know what they offer or how they differ from other elder care facilities.

A 10th victim has died from the fire that ripped through a Massachusetts assisted-living facility earlier this week, officials said Thursday, as records and accounts from staff raise concerns about conditions at Gabriel House before the blaze.