When the first season premiered in December 2015, it became an instant phenomenon. For weeks all people wanted to talk about was the once little-known murder trial from Manitowoc County, Wisconsin.
The first instalment of the true crime doco-series looked at the case of Steven Avery – a man who was wrongly convicted and exonerated for rape, and then later convicted for the murder of 25-year-old photographer, Teresa Halbach.
Avery’s teenage nephew, Brendan Dassey, was also convicted for his alleged role in the crime.
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The first season generated a huge amount of debate around whether Avery was actually guilty or once again wrongly convicted. Most viewers sat firmly on either side of the debate.
After the series aired, both Avery and Dassey launched appeals.
In 2016, a judge ruled that Dassey should be released from prison. But then another judge ruled that he should remain in prison.