PEMBROKE, Mass. — Virginia “Ginny” Hannon’s bloody 1984 murder threatened to overshadow the good memories of the beloved school lunch lady, who was known for baking treats for her neighborhood’s children and taking in stray animals. As each year passed, Hannon’s loved ones feared that they’d never learn who beat, strangled and stabbed Hannon, 59, to death in her Pembroke, Massachusetts, home.