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A routine visit by a home attendant led to a gruesome discovery over the weekend in Brooklyn, where a woman was killed and her husband was wounded in a knife attack, the police said.

The woman, Maria Rodriguez, 71, had been stabbed several times in the torso and died in her home, according to the police. Her 87-year-old husband, who uses a wheelchair, was stabbed in the chest and slashed across the arm. He was taken to Bellevue Hospital Center, where he remained in serious condition on Sunday.

Investigators were looking to speak with the couple's 55-year-old son, Oscar Rodriguez, Jr., who checked himself into a nearby hospital’s psychiatric ward on Saturday, according to a police official. No arrests had been made by Sunday evening and the police did not offer a motive for the attack.