Donatila O’Mahony Wiki – Donatila O’Mahony Biography Donatila O’Mahony a 43-year-old Long Island woman convicted of the “cold-blooded” execution of a 69-year-old homeowner for forging his will and taking up residence on the property will spend a quarter century until life in her “new home.” “: Prison. Prosecutors with Suffolk County District Attorney Raymond A. […]