Trouble had been growing between Scott Sterling and his best friend, Philip Scheid, 19, a companion since kindergarten. Scheid and his parents, Philip and Terri, also live in Beverly Hills, but with far less wealth than the Sterlings. A major problem seemed to be a girl. Together they had met a young actress and, over a period of months, both became involved with her. She is Lindsey McKeon, then 17, of Studio City, an actress on the TV sitcoms "Opposite Sex" and "Saved by the Bell: The New Class." Sterling had strong feelings for McKeon--Scheid would later say of his friend, "He gets crazy when it comes to her."