A 40-year-old woman from Redruth has been released on police bail after being arrested on suspicion of murder.
The arrest relates to a fire at the Rosewyn House Care home on Alverton Terrace, Truro on November 24, 2008.
A 96-year-old female resident of the home died in hospital a week after the fire as a result of smoke inhalation.
The suspect was arrested yesterday, Wednesday, March 12 2014 and later released on Police bail until 27 May 2014.
Investigating officers have urged anyone who may have information regarding the incident to contact them on 101 or Crimestoppers in confidence on 0800 555 111, quoting reference GT/13/1051.