John Clement Sizer passed away peacefully on March 22, 2018. He leaves behind his beautiful wife for the past 59 years, Gabriella and their children Maria, Tom and John Jr., along with 8 grandchildren, 3 step-grandchildren and 5 great-grandchildren, and many other close relatives in Chicago and Mexico. John was an avid runner, golfer, family man and was well known for providing counsel and advice to many other men with prostate cancer, and their families. Visitation will be held from 6:00 P.M. to 8:00 P.M. with a Rosary Service at 7:00 P.M. on Tuesday, March 27, 2018 at Whitney & Murphy Funeral Home, 4800 E. Indian School Road, Phoenix. A Funeral Mass will be celebrated at 10:30 A.M. on Wednesday, March 28th, at St. Thomas the Apostle Catholic Church, 2312 E. Campbell Avenue, Phoenix.