On Wednesday, March 13, 2019, of Silver Spring, MD. Beloved husband of Lexie A. McMahon; father of Diane M. Kerr of Laurel, MD, John J. McMahon of Arlington, VA, Charles S. Dowrick (Cindy) of Olney, MD, and Brian J. McMahon of Las Vegas, NV; grandfather of Devon, Douglas, Ashley, Ryan, and Austin; great-grandfather of Nathaniel and Drew. Relatives and friends may call at Collins Funeral Home, 500 University Boulevard West, Silver Spring, MD, 20901 (Valet Parking), Sunday, March 17, from 2 to 4 and 7 to 9 p.m. Private Interment at a later date. In lieu of flowers, memorial contributions may be made to Parkinson Foundation of the National Capital Area, 7700 Leesburg Pike, Suite 208, Falls Church, VA 22043.