Robert Knight has been charged with the murder of June Knight at Langley Lodge care home in Westcliff-on-Sea, Essex.
The 52-year-old, of Leigh-on-Sea, will appear before magistrates in Southend.
Police have yet to confirm how Mrs Knight was killed but a post mortem into her death is set to take place in the coming days.
Members of staff at the home have been left "utterly shocked" by the murder and are now working to offer support to the other residents and their families.
Many family members arriving yesterday to visit residents were unaware of the events of Monday night.
Scenes of crime officers were moving in and out of the imposing three-storey whitewash home near the Thames Estuary yesterday.
Martin Bandelow said the care home deals with seriously ill patients and is difficult to enter unless you're a family member.
He said: "It's got loads of dementia patients or seriously ill patients, I think it's end-of-life care.
"We quite often see an ambulance there.
"It's really hard to get into the home unless you're a family member – when I've been there they ask who you are before they let you through the door.
"Last night we saw an ambulance and two or three police cars. How dreadful that someone has been killed."
One woman said: "It's really shocking. There were about four police cars pulled up outside and a large police van.
"To think that it's someone who killed a family member is really upsetting, especially at this time of year."
The home was last inspected in September with a full Care Quality Commission report published earlier this year and was rated as 'good' overall.
Inspectors found the residents were well looked after.
They concluded: "People had sufficient amounts to eat and drink to ensure that their dietary and nutritional needs were met.
"The service worked well with other professionals to ensure that people's health needs were met…
"Staff were well trained and attentive to people's needs. Staff were able to demonstrate that they knew people well. Staff treated people with dignity and respect."
An Essex Police spokesman said: "We are not looking for anyone else in connection with the death of the woman, who was related to the suspect."
A spokesman for the home said: "Langley Lodge Nursing Home can confirm that an incident took place.
"We are utterly shocked by what happened and we are cooperating with the police on this matter.
"We are providing support to other residents and their families. We will not comment further at this time."
An East of England Ambulance Service spokeswoman said: "We were called at 10.05pm on Monday with reports of an incident in Imperial Avenue, Westcliff.
"We sent an ambulance, ambulance officer and a rapid response vehicle.
"Sadly one person died at the scene."
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