Independent experts affiliated with the United Nations (UN) say that reports suggested she was severely beaten by the morality police, without offering evidence.
Her death has led to public outcry both inside and outside Iran and has been condemned by the United States, the European Union and the UN.
Who are the morality police?
Huge swathes of Iranian society are covered by strict morality laws, stipulating what people can do, say and wearn – and what they can’t.
The morality police – known as the Guidance Patrol – routinely detain women who they say are not wearing hijabs, or are wearing them incorrectly.
They were established in 2005 by Iran’s judiciary and police to enforce the strict dress code, as authorities sought to grapple with a quickly changing society.
The force is stationed across public areas and made up of men as well as women.
President Hassan Rouhani – considered to be a moderate politician – had pledged to remove the morality police from the streets during his election campaign.
However despite Mr Rouhani changing several police commanders the Guidance Patrol remains powerful a year after he left office.
How big are the protests in Iran at the moment?
Miss Amini’s death has prompted Iranians to take to the streets of Tehran and at least 12 other cities in the country.
Many Iranians, particularly the young, have come to see her death as part of the Islamic Republic’s heavy-handed policing of dissent and the morality police’s increasingly violent treatment of young women.
As of Friday 23 September, 26 people had died in protests.
The protests are the most serious in the repressive country since 2019, when demonstrations erupted over a government hike in the price of gasoline.
According to the Human Rights Watch organisation, Iranian courts have reportedly issued or upheld at least four execution sentences in connection to protests.
Women burned headscarves and cut their hair in protests
Why are women cutting their hair?
Women have played a prominent role in the recent demonstrations, waving and burning their veils, with some publicly cutting their hair in a direct challenge to clerical leaders.
A wave of women worldwide have uploaded videos to social media, cutting off their hair in solidarity with Iranian women and protests have been taking place in several countries.
