An 86-year-old woman was murdered in a "brutal assault" at her Cambridgeshire home, police said.
Una Crown, who was last seen alive on Friday, was found in her bungalow in Magazine Lane, Wisbech, on Sunday morning.
Post-mortem tests carried out on Tuesday found she died from injuries sustained in an assault.
Police are not linking the murder to any other crimes and said it was "too early" to say what the motive was.
Det Ch Insp Jon Hutchinson said: "Mrs Crown died as a result of a brutal assault in her own home.
"Our investigation is still at a very early stage and we are trying to build up a picture of the events that lead to her death."
Mr Hutchinson said one possibility was that Mrs Crown had been killed after a suspect broke into the house.
She lived alone and had no children.
Neighbour Maureen Lawrence said: "When I heard she had died I presumed, because of her age, she had died peacefully but now we are hearing differently, which is very upsetting.
"I'm not aware of there being any problems with crime in the area and we hadn't noticed anything suspicious."