[4] He told a meeting of electors that this was due to medical advice,[6] while a biographical article in the Australian Town and Country Journal attributes his retirement to the pressures of business.
[8] Williamson had moved to Rydalmere in 1886,[9] and in 1891 successfully organised a petition to divide the Borough of Dundas.
[10] He was elected one of 6 aldermen on the resulting Borough of Ermington and Rydalmere, serving as mayor from 1891 until 1893.
[11] He unsuccessfully applied to be re-admitted in November 1896,[12] but was allowed to be employed as a solicitor's clerk.
The coroner found that Williamson had committed suicide by taking cyanide.