Independent Bob Such  died from a brain tumour on 11 October 2014 which triggered a by-election in Fisher for 6 December.
Labor's Nat Cook won the by-election by nine votes with a 7.3 percent two-party swing against the Liberals, resulting in a change from minority to majority government.
On a 0.02 percent margin it is the most marginal seat in parliament.
Despite this, the Weatherill Labor government kept crossbench MPs Geoff Brock and Martin Hamilton-Smith in cabinet, giving the government a 26 to 21 parliamentary majority.
ABC psephologist Antony Green described the by-election as a "very bad result for the Liberal Party in South Australia" both state and federally, and that a fourth term government gaining a seat at a by-election is unprecedented in Australian history.

Liberal Iain Evans in Davenport resigned from parliament on 30 October 2014 which triggered a 2015 Davenport by-election for 31 January.
Liberal Sam Duluk won the seat despite a five percent two-party swing, turning the historically safe seat of Davenport in to a two-party marginal seat for the first time.
ABC psephologist Antony Green described it as "another poor result for the South Australian Liberal Party", following the 2014 Fisher by-election which saw Labor go from minority to majority government.
Independent Bob Such  died from a brain tumour on 11 October 2014 which triggered a by-election in Fisher for 6 December. Labor's Nat Cook won the by-election by nine votes with a 7.3 percent two-party swing against the Liberals, resulting in a change from minority to majority government. On a 0.02 percent margin it is the most marginal seat in parliament. Despite this, the Weatherill Labor government kept crossbench MPs Geoff Brock and Martin Hamilton-Smith in cabinet, giving the government a 26 to 21 parliamentary majority. ABC psephologist Antony Green described the by-election as a "very bad result for the Liberal Party in South Australia" both state and federally, and that a fourth term government gaining a seat at a by-election is unprecedented in Australian history.
Liberal Iain Evans in Davenport resigned from parliament on 30 October 2014 which triggered a 2015 Davenport by-election for 31 January. Liberal Sam Duluk won the seat despite a five percent two-party swing, turning the historically safe seat of Davenport in to a two-party marginal seat for the first time. ABC psephologist Antony Green described it as "another poor result for the South Australian Liberal Party", following the 2014 Fisher by-election which saw Labor go from minority to majority government.
2018 South Australian state election