A woman arrested on suspicion of the murder of a five-year-old boy has been detained under the Mental Health Act.
Tyler Warmington's body was found at Bromsgrove Cottages in Faringdon, Oxfordshire, on 14 March.
A post-mortem examination found he had been stabbed in the chest.
A 40-year-old woman questioned in connection with the death has now been detained under the Act, Thames Valley Police said. She has not been charged but the investigation is ongoing.