Gary S. Leisten of Westchester formerly of Forest Park, age 76. Army Veteran; FBI Academy graduate Class #143 and Retired Chief of Police of Forest Park. Beloved husband of Vickie, nee Petruzzelli; loving father of Christine (Phillip) Grollo, Jr and Scott (Dawn) Leisten; proud grandfather of Phillip (Olimpia) Grollo, III, Gianna (Matthew) Mihic, Lisa Marie (Matthew Eslick) Grollo and Jacob Dominic Leisten; great-grandfather of Cecilia Christine Mihic; cherished son of the late Frank T. and Elaine M. Leisten; dear brother of Ron (Carlotta) Leisten, Brian Leisten and the late Thomas Leisten; cherished brother-in-law of Gemina Petruzzelli; fond uncle of many. Family and friends will be received at the Conboy-Westchester Funeral Home, 10501 W. Cermak Rd., Westchester on Tuesday, June 3, 2025 from 3:00 p.m. to 8:00 p.m. Funeral Wednesday 9:00 a.m. until time of Chapel Service 10:00 a.m. Entombment Queen of Heaven Cemetery. In lieu of flowers, memorials appreciated to Tunnel to Towers Foundation (www.T2T.org). For funeral info 708-F-U-N-E-R-A-L.