NORTHAMPTON, Mass. (WWLP) – A man accused of killing his 4-month-old baby with a lethal dose of adult sleep medication was arraigned Friday in Hampshire Superior Court.

After a three-year investigation into the death of his infant son, 35-year-old Isaac Villalobos (also known as Angel M. Carattini-Rivera) pled not guilty to manslaughter, assault and battery on a child causing substantial injury, reckless endangerment of a child, and assault and battery with a dangerous weapon on a child under 14.

The baby died in September 2019. At the time, Villalobos lived in Amherst with the baby’s mother. A warrant for his arrest was issued in all 50 states and he was arrested in Maryland and brought back to Massachusetts on July 14.

His bail is set at $250,000 and scheduled to be back in court on September 12.