A 27-year-old man has been charged with murder after the bodies of three men in their 80s were found in two properties in Exeter, Devon and Cornwall Police said.
Alexander Lewis-Ranwell, 27, from Croyde, North Devon is charged with murdering Anthony Payne, 80, and twins Richard and Roger Carter, 84, who all lived in Exeter.
He has also been charged with two offences of causing grievous bodily harm with intent.
He remains in custody and will appear at Exeter Magistrates' Court on Saturday.
Mr Payne was found dead at his property in Bonhay Road on February 11, a day before Richard and Roger were found at a property in Cowick Lane.
Detective Chief Inspector, Roy Linden, deputy head of major crime, said: "I would like to start by thanking everyone who has supported this investigation.
"Given this is now subject to formal court proceedings, we would remind everyone that Contempt of Court rules apply. It is therefore essential that no-one speculates about the investigation, particularly on social media.
"It is essential that we maintain the fairness and integrity of the court process."
Superintendent Matt Lawler, local policing commander for Exeter, East and Mid Devon, said: "All of our thoughts remain with the family and friends of the victims."
"You'll continue to see officers on foot patrol, speaking to residents, and conducting investigative work at the two addresses in the city over the coming days.
"We are grateful for the messages of support that communities in and around Exeter have been expressing in recent days.
"We would like to sincerely thank local residents, our partner agencies and local councillors for their understanding and co-operation."
Lewis-Ranwell, who was first arrested on Tuesday evening, remains in custody.
Tributes have been paid to the three elderly men, who all sustained serious head injuries.
Martyn Liddon, 76, who runs the Exeter-based Men In Sheds charity, said he was "gutted" to hear of the deaths of Dick and Roger Carter.
"I don't think they had a bad bone in their body, either of them," he said. "Roger had pretty bad arthritis and he used to hobble down to Sainsbury's.
"If I saw him walking along I used to say good morning.
"He was a bit more of a recluse than Dick was."