Mastroianni, Louis "Lou", of O'Fallon, Missouri, died on Tuesday, April 16, 2013 at the age of 79. Loving husband of Stella Mastroianni; beloved son of the late Louis and Willette Mastroianni; devoted father of Mark (Judy) Mastroianni, Michele Mastroianni, Matthew (Beverly) Mastroianni, and Martin (Vanessa) Mastroianni; cherished grandfather of 16; treasured great-grandfather of 10; dear brother of Joan. Memorials may be made to Disabled American Veteran's or American Diabetes Association