SIMON-Derek R., 23. Visitation 5 p.m., vigil service 7 p.m. July 19 at West Center Chapel. Funeral Mass 10 a.m. July 20 at Holy Ghost Church. Interment Evergreen Cemetery. Survived by parents, Pat and Siobhan Simon; brothers and sisters-in-law, Scot and Tiffany Simon, and Nicholas and Alexis Simon; niece; nephew; sister, Shannon Simon; grandfather, Ronald E. Davidson; aunts; uncles; relatives; friends. Memorials to Children's Hospital.