Hacker, John "Jack" F., of O'Fallon, Missouri, died on Tuesday, February 26, 2013 at the age of 76. Loving husband of Lynne Hacker (NEE: Carlson); beloved son of the late Florian and Lorna Hacker; devoted father of Deborah Griesenauer, Kenneth (Pat) Hacker, and Matthew (Kim) Hacker; cherished grandfather of Jacob (Shannon), Kurt, Luke, Rex, Amy, Kelsey, Lexie, Colin, and Abby; dear brother of Richard (Dae) Hacker and Steven (Marcia) Hacker.