A 24-year-old man allegedly beat his girlfriend’s baby boy to death with a leather belt because he urinated on him during a diaper change. Austin Hamilton is charged with first degree murder and aggravated child abuse for allegedly ‘losing control’ and repeatedly hitting one-year-old Sincere Williams on Saturday. Sincere died in hospital, with the medical examiner ruling the death a homicide. WFLA reported Hamilton was babysitting girlfriend Tiffany Williams’s two sons, Sincere and a six-year-old boy, at Motel 6 in Tampa, Florida on Saturday morning while she was at work. About 8.20pm that night, Hamilton called 911 when Sincere struggled to breathe.