!!!!SOLVED!!!!! In March of 2023, serial killer Richard Cottingham confessed to Mary Ann’s murder. The MurderedNJ Cold CaseMary Ann Della SallaBergen County Mary Ann Della Salla was 17 years old when she disappeared in 1967. She was living at 150 Hobart Street in Hackensack, Bergen County, New Jersey. She was a senior at Hackensack High... Continue Reading →