According to a report from The Associated Press, a 38-year-old woman and her 38-year-old boyfriend killed her disabled 13-year-old son by placing alcohol in his IV bag.

Melissa Robitille and Walter Richter III were reportedly charged with second-degree murder on Tuesday.

Citing police, The AP notes that Robitille’s son, Isaac Robitille, had several disabilities that necessitated the help of caretakers, as well as IV tubes.

Robitille and Richter, who originally reported Isaac’s death to authorities at the end of August, were taken into custody on Tuesday and charged with second-degree murder after authorities discovered that the 13 year old had a BAC of .146 when he died, Reuters reports.

According to WCAX, authorities believe that Robitille and Richter deliberately added alcohol to Isaac’s IV bag.

“The Vermont Office of the Chief Medical Examiner (OCME) reported the cause of death as ‘Semi-Lobar Holoprosencephaly with a contributory cause of death as Alcohol’ and the manner of death as ‘Homicide,'” a statement from the Vermont State Police read. 

The National Institute of Alcohol Abuse and Alcoholism points out that alcohol poisoning takes place when there is so much alcohol in the bloodstream that areas of the brain managing basic life-supporting functions (breathing, heart rate and temperature control) start to shutdown.

Authorities do not know at this point when the couple will be arraigned, but they are currently jailed at the Northeast Correctional Complex in St. Johnsbury, Vermont, the Burlington Free Press reports.

“Once Robitille and Richter are processed, an update will be issued which will include information regarding bail, lodging, and arraignment,” the VSP statement noted.