William left a note for his mother at their family's Seattle, Washington residence on May 8, 1987. The letter stated that he was spending the night at a friend's home. When William failed to return to his house the following day, the friend said that he never saw him the evening before. Another witness stated that William was seen entering a large white car, possibly a 1974 or 1975 Chevrolet Impala, in Seattle later in the day on May 8. He may have remained in the general area after his disappearance. He has never been heard from again. William has scars on his left nostril and near his right eye. His upper left front tooth was chipped at a pronounced diagonal angle at the time of his 1987 disappearance. William's left ear is pierced. His nickname is Billy. William is right-handed. He spoke with a deep, husky voice in 1987.