A by-election was held for the New South Wales Legislative Assembly electorate of Heffron on 23 June 1990 because of the resignation of Laurie Brereton to successfully contest the 1990 federal election for Kingsford Smith[1] The Labor candidate for the election was Deirdre Grusovin, the sister of Brereton.[2]
The Heffron by-election was held the same day as the Granville and Smithfield by-elections.
| Date | Event | |
|---|---|---|
| 17 February 1990 | Resignation of Laurie Brereton. | |
| 24 March 1990 | 1990 federal election | |
| 25 May 1990 | Writ of election issued by the Speaker of the Legislative Assembly and close of electoral rolls.[3] | |
| 1 June 1990 | Nominations | |
| 23 June 1990 | Polling day | |
| 13 July 1990 | Return of writ |