(04/06/1848-09/03/1923).
He was born in Bunbury and died at Mount Lawley. William was the second son of James Thompson and Harriet nee Moore. William got married in 1873 to Jane Charlotte Howell (26/11/1854-11/03/1920). Jane was the daughter of William and Elizabeth nee Denton. William and Jane's children were Grace Hilda, who died at five years of age. Their children were Frank (1876-1897), Myra Gertrude (1881-1969), Rohilla (1884-1973), Myrtle Harriet (1887-1964), Irwin Fitzroy (1889-1956), Raymond Forrest (1890-1943), Ruby Valette (1891-1974), Hazel Geraldine (1899-1951) and Gordon Ord (1900-1960). William joined the police force in 1871 and served at Perth, Dongara, Guildford, Roebourne and Geraldton. William was a corporal during 1879 and a Sub-Inspector during 1885. William went to the Kimberley in 1889 and was in charge of the North West, being an Inspector in 1893 and being promoted to Chief Inspector in 1899. William travelled to Perth in 1900 and became the Superintendent of the Police in the Metropolitan area. William retired in 1912. He was a Justice of the Peace in 1900. He was educated in Picton. His religion was presbyterian.