An 89-year-old woman has been stabbed to death in south London, police have said.
The pensioner was found injured at a home in Brigstock Road, Thornton Heath, at around 9.20pm on Tuesday.
Paramedics tried to save her but she was pronounced dead at the scene. Her family have been told.
The Metropolitan Police said that a man aged in his 30s was arrested at another address in Croydon a short time later and that no one else is being sought in connection with the death.
The suspect and the woman who died are believed to have known each other.
Anyone with information can call the police on 101 quoting the reference 7790/21jun.