p class="MsoNormal" ;" " Arial; "of Clarkston. August 4, 2012 age 52. " Arial; ;"Husband of Laura J. Father of Alex and Christina Henke. Beloved son of Judith (Mike) Retzlaff and the late John Edward Henke. Also survived by many other family members. John was the owner of John Henkersquo;s Lawn Service in Clarkston. He enjoyed his loyal customers and co-workers. " Arial; ;