The so-called "torso killer" or "Times Square killer," who claims to have murdered up to 100 people in New York and New Jersey, pleaded guilty on Monday to the 1968 killing of Long Island single mother Diane Cusick and also admitted to the slayings of another four women in Nassau County from 1972-73. Richard Cottingham, 73, is already serving a life sentence in New Jersey state prison for murdering nearly a dozen women and girls in the 1960s.