A man convicted of killing his mother and a newlywed Washington state couple has been returned to Massachusetts to face a murder charge in a 1988 slaying, prosecutors said. Daniel Tavares, 47, will be arraigned Monday in Fall River Superior Court, the Bristol district attorney’s office said. Tavares was indicted in April for the stabbing death of Gayle Botelho. Botelho, 32, a mother of three young children, disappeared after telling her roommate she was leaving her Fall River apartment for a few minutes. Her remains were found 12 years later in the backyard of a Fall River house where Tavares had lived.