It's never been proven he killed her. But he had a young female housekeeper, and one day while cleaning the house, she entered a room, which Morello had always kept the door to, closed. She opened it and went about her business and discovered a printing press, which the Morello gang used for their early counterfeiting operation. The girl went missing after the day of her supposed discovery. Some mafia historians believe Morello had the girl killed fearing she'd talk to the authorities about what she discovered, and blowing the lid on the Morello Families counterfeit money racket.