Robert M.Byron of 307 Water St.;Belle Vernon;died suddenly of an apparent heart attack on Tuesday;Aug.4;1987;at 12:05 p.m. at Mon Valley Hospital. He was 43. Mr.Byron was born Sept.6;1943;in Pittsburgh;a son of Leonard Byron of Belle Vernon and the late Lorenna Barnes Kontos. He was a member of St.Sebastian Roman Catholic Church;Belle Vernon;and the Belle Vernon Musical Society. Mr.Byron;a U.A.Air Force veteran of the Vietnam war;had lived in Belle Vernon the past 32 years. A former employee of the Wheeling-Pittsburgh Steel Corp.;Allenport plant for 13 years;Mr.Byron was employed by the Solstat Coal Company of Mt.Pleasant. In addition to his father;survivors include his wife;Nancy Bitonti Byron;a son;Jamie Robert Byron at home;a daughter;Melissa Ann Byron at home;three brothers;Douglas and Kenneth Byron;both of Belle Vernon;and Lawrence Byron of McDonald;Ohio;two sisters;Susan Priloh of the state of Indiana and Mrs.Barry (Wendy) Mellinger of Belle Vernon;and his mother-in-law;Rose Bitonti of Belle Vernon. Friends will be received Wednesday from 7 to 9 p.m. and Thursday from 2 to 4 and 7 to 9 p.m. in the Shelby D.Ferguson Funeral Home;700 Broad Ave.;Belle Vernon;where a prayer service will be held Friday;Aug.7;at 9:30 a.m.;followed by a Mass of Christian Burial at 10 a.m. in St.Sebastian R.C.Church. Burial will be in Belle Vernon Cemetery. Shelby D.Ferguson;funeral director;is in charge of arrangements.