A 40-year-old woman has been charged with the murder of a 10-year-old boy, police said.
A woman walked into a police station in the early hours of Sunday to speak to officers and the boy was later found dead at a home in Cumberland Park, Acton, west London.
Olga Freeman will appear at Uxbridge Magistrates' Court on Monday.
Police believe they know the identity of the boy, who was known to Freeman, Scotland Yard said.
No-one else is being sought in connection with the death.
Reverend Nick Jones, 61, the rector of Acton, who lives in Cumberland Park, said on Sunday that news of the boy's death was "shattering".
He said: "I'm still shaking a bit, it's hugely upsetting."
Another neighbour said he was "in shock".
A post-mortem examination will be held in due course.