William J. "Billy" Barth Jr. 88, of Mentor passed away peacefully with his family by his side on Saturday August 30, 2025 at University Hospitals Tripoint Medical Center in Painesville.  He was born August 29, 1937 in Cleveland.  Billy served in the Intelligence Division with The U.S. Army. He was a multi million dollar realtor, and was involved in numerous area realtor associations.  Billy was one of the founding members of The Bay Village Jaycees. He loved his family, and was always upbeat with a fantastic sense of humor. Billy will be missed by all who knew and loved him.  Survivors include his son; Andrew J. "AJ" Barth (Lonnie), additional survivors include two grandchildren; Amber Cowdrick (Tim), Collin J. Barth (Ashley), three great grandchildren; Paisley, Ellie, John Reece, Billy was preceded in death by his wife of fifty nine years; Cynthia K. (nee: Kirkwood), his parents; William J. Sr. and Gladys (nee: Brennan), and two brothers; Don Barth (Claudette), Rene Barth (Eleanore). Billy is also survived by a sister; Irene Patton (Patrick).  The family will receive friends from 12-2 PM and 4-7 PM Thursday September 4, 2025 at The Laubenthal Mercado Funeral Home 38475 Chestnut Ridge Rd. Elyria, OH 44035 (440-322-4626.  Burial will be at Ohio Western Reserve National Cemetery with full military honors provided by the U.S. Army. Online condolences to the family may be expressed at www.laubnethalmercado.com