Mr. William J. (B.J.) Smith, Jr., 20, died early Sunday (March 3, 2002) morning at the Doctor's Hospital in Augusta following injuries received in a house fire.      He was a native of Waycross and had resided most of his life in Waycross.  He was an employee of Clayton Homes and was a member of the Temple Baptist Church.      The survivors include a son, Brett Austin Smith of Blackshear; his parents, William Joseph and Syble Smith, Sr. of Waycross; two sisters, Susan Joyce Caviness and Syble Ann Wimberly both of Waycross; an adopted brother, Aberial Morris of Waycross; his grandparents, Betty Nell Byrd of Blackshear, Joyce Ann Smith of Waycross, Donald Eugene Arnett, Sr. of Hicksville, Ohio; Numerous aunts, uncles and other relatives.      A graveside service will be held at 3:00 p.m. Tuesday at Liberty Baptist Church Cemetery.  The family will be receiving friends at Music Funeral Home Tuesday from 1 until 2 o'clock.