A woman and her partner who were arrested on suspicion of the murder of a two-year-old boy have been released on police bail.
Keanu Williams, known as Kiwi to friends and family, was pronounced dead in hospital on Sunday night.
West Midlands Police said he was taken to hospital from an address in Old Moat Way in the Ward End area of Birmingham at 7.42pm.
Keanu's 22-year-old mother and her partner, 29, were released without charge after four days of questioning.
A police spokesman said: "The 29-year-old man and a 22-year-old woman arrested in connection with the death of Keanu Williams have this evening been released on police bail.
"Family liaison officers continue to support the family during this difficult time."
Police said a post-mortem examination carried out on Tuesday indicated the child died from "non-accidental injuries".