She's 5 feet, 2 inches tall, and weighs about 160 pounds.
Her family says she is diabetic and may be showing signs of mental confusion.
She was married to Phil Spector in 1963.
Spector is now serving 19 years in prison after being convicted in April of murder.
Anyone with information on Merar's whereabouts is asked to call LAPD detectives in Van Nuys at (818) 756-8371.