A Rotterdam man is accused of stabbing his 79-year-old mother to death was arraigned Friday in Schenectady County Court.

Patrick Haggerty, 39, is charged with second-degree murder and criminal possession of a weapon in the death of Catherine Haggerty.

Police said she had been stabbed in the neck in a domestic incident at Cobblestone Court.

Haggerty’s attorney, Lauren Mack, waived a formal reading of the charges and entered a not guilty plea on his behalf.

Dressed in an orange prison jumpsuit, Haggerty gave simple answers such as “Yes, thank you, your honor,” when the judge was explaining the process as the case moves through the legal system.

Deputy Chief Assistant District Attorney Christina Tremante said they have not yet turned over all relevant materials to the defense because of the volume of materials and number of agencies involved in the case. They were requesting more time.

Haggerty is due back in court on May 9 at 9:30 a.m. for an update.