Deborah Wilner was found stabbed in her Flower Mound living room, a black cloth over her face, two kitchen knives nearby.
Her son, Eric Michael Wilner, 31, is accused of stabbing her and then killing himself. Police say the two had argued over their drug use.
Police believe Wilner's husband, a University of North Texas accounting professor, slept through the attack. They say he alerted the authorities when he awoke and discovered the bodies.