The HBO docu-series “Who Killed Garrett Phillips?” investigates the 2011 murder of 12-year-old Garrett Phillips in a small New York town, examining the trial of Oral “Nick” Hillary, who was acquitted of the crime. The series explores the many theories surrounding the murder, including the possibility that Hillary was the perpetrator, that Phillips was involved in a fight with other children, or that the true killer was a sheriff’s deputy with a history with Phillips’ mother. The docu-series highlights allegations of prosecutorial misconduct and questions the evidence presented in Hillary’s trial, ultimately leaving the identity of the killer unresolved.