Amnesty International said her subsequent trial was "grossly unfair", as she was denied access to a lawyer during her entire pre-trial detention period and only met her state-appointed lawyer for the first time at her final trial session on October 18, 2014. At this session she retracted "confessions" made when she'd had no access to legal representation.
Sekaanvand told the court that her husband's brother, who she said had raped her several times, was responsible for the murder and had coerced her into "confessing", promising he would pardon her.
Under Islamic law, murder victims' relatives have the power to pardon the offender and accept financial compensation instead.
This statement was ignored by the court, which instead relied heavily on her "confessions" to reach its verdict.
Two years later the Criminal Court of West Azerbaijan Province sentenced Sekaanvand to death.
Sekaanvand became pregnant while behind bars, after reportedly forming a relationship with a fellow prisoner. But she delivered a stillborn child on September 30, meaning Iranian authorities have the go-ahead for her execution because she is no longer pregnant.
"This is an extremely disturbing case," Philip Luther from Amnesty International said in a statement.
"Not only was Zeinab Sekaanvand under 18 years of age at the time of the crime, she was also denied access to a lawyer, and says she was tortured after her arrest by male police officers through beatings all over her body.
"Iran's continued use of the death penalty against juvenile offenders displays the authorities' contempt even for commitments they themselves have signed up to.
"The Iranian authorities must immediately quash Zeinab Sekaanvand's conviction and grant her a fair retrial without recourse to the death penalty."
Another 49 people who were children when they committed their offence are said to be on death row in the country.
