Two charged with killing son by putting alcohol in IV Elizabeth Murray, Burlington (Vt.) Free Press 11 p.m. EDT October 7, 2014 (Photo: Courtesy Vermont State Police ) COMMENTEMAIL BURLINGTON, Vt. — A Hardwick mother and her boyfriend are in custody and facing murder charges after state police said the two put alcohol in the IV bag of the woman's disabled son. Isaac Robitille, 13, was discovered dead in August by his mother, who called Hardwick police to the scene, the Vermont State Police said Tuesday evening. Melissa Robitille, 38, and her boyfriend, Walter Richter III, 38, were arrested Tuesday on suspicion of second-degree murder after an almost two-month investigation. According to police, Robitille discovered called the police shortly after finding Isaac dead at 9 a.m. Aug. 22. Isaac was born with significant medical conditions, including multiple physical handicaps that required the assistance of caretakers, feeding tubes and IVs to keep him alive, police said. An autopsy was performed by the Vermont Chief Medical Examiner's Office to determine the cause and manner of Isaac's death. Police waited for toxicology and for a final autopsy report to be completed. The toxicology report, received Sept. 5, showed that Isaac's blood alcohol content was 0.146 percent, police said. The medical examiner reported that a contributing cause of death was alcohol, and the manner of death was homicide. Walter Richter III(Photo: Courtesy Vermont State Police) Police investigators determined that Robitille and Richter had placed alcohol in Isaac's IV bag and administered it to him. Robitille and Richter both were jailed Tuesday evening at the Northeast Correctional Complex in St. Johnsbury, according to the Corrections Department. Police said they had no initial information about their bail conditions or when they would be arraigned.