Charges have been amended against the uncle of a 4-month-old Oklahoma City boy who was taken to a hospital in April with injuries determined to be consistent with child abuse. The paternal uncle of Darren Cosby Jr. was initially arrested on one count of child abuse. The baby died June 7 of his injuries and the Medical Examiner's office later ruled the death a homicide. The boy's uncle, 22-year-old Isaiah Cosby, was still in the Oklahoma County jail. Oklahoma City police said Wednesday that the charge against Cosby has been amended to first-degree murder.