New York - Michael Brea, 31, who had a role in the TV comedy "Ugly Betty", stabbed his mother to death with a 3-foot (90 centimetres) sword.
According to the police, Yannick Brea, 55, was found kneeling in the bathroom of her home in Brooklyn with head cuts on Tuesday. She was pronounced dead at the scene.
Brea was arrested on charges of murder and criminal possession of a weapon and is currently undergoing psychiatric evaluation at Kings County Hospital.
It was not known if he had an attorney.
Brea had no prior arrests and it was not known if he had a psychiatric history, said Police Commissioner Raymond Kelly.