Lois Mae Prosser of 201 Westgate Manor;Monessen;died Saturday at 6 p.m. in the H.C.Frick Community Hospital;Mount Pleasant. She was 54. Mrs.Prosser was born Sept.8;1929;in Alliquippa;a daughter of the late Charles Illinsky;who died Sept.28;1983;and Margaret Ashley Illinsky;who died June 5;1977. A Monessen resident most of her life;she was a former employee of Corning Glass Works;Charleroi. Mrs.Prosser was also formerly employed by the Headstart Program in the Graham Street School;Belle Vernon. Survivors include five sons;Louis;serving with the U.S.Navy in Chicago;Ill.;David of Monessen;Gary of St.Petersburg;Fla.;Gordon of Bedford;Ohio;and Scott of Monessen;one daughter;Mrs.Mark (Peggi) Courtley of Belle vernon R.D.;two brothers;Bruce B.Pezzelle of Monessen and Gordon D.Pezzelle of Belle Vernon;and eight grandchildren. Friends will be received Monday from 7 to 9 p.m. and Tuesday from 2 to 4 and 7 to 9 p.m. in the Shelby D.Ferguson Funeral Home;700 Broad Ave.;Belle Vernon;where services will be held Wednesday;Dec.21;at 11 a.m. with the Rev.Kenneth Neiderhiser;pastor of the Belle Vernon Church of the Nazarene;officiating. Burial will be in Belle Vernon Cemetery. Shelby D.Ferguson;funeral director;is in charge of arrangements.