A North Tonawanda woman fatally stabbed her boyfriend in her apartment late Wednesday night and was being arraigned this morning on a charge of second-degree murder, authorities said.Jennifer R. Marchant, 23, of 580 Oliver St., allegedly stabbed Ralph D. Stone Jr., 24, of 11th Avenue, North Tonawanda, in the neck at about 10:30 p.m., according to North Tonawanda Police Chief Randy D.