 This product may only be used for emergency self-defense purposes or to train. Please be trained for use accordingly. FDNY firefighter Daniel Foley assisted in rescue and recovery efforts at Ground Zero. But Daniel couldn't have known then that his heroism would cost him his life more than 18 years later. His death, like so many others, resulted from 9-11 related illnesses caused by the toxic dust that formed when the Twin Towers collapsed.