"Noura Hussein's death sentence violates her rights under the Sudanese constitution and global law", Equality Now's letter stated.
Her legal team has 15 days to appeal the verdict. Hussien's team will reject and appeal the death penalty, as she was defending herself at the time of the killing and was mentally and psychologically disturbed as a result of rape, according to the Guardian.
When Hussein returned to her home in Khartoum, Ms Hussein says she refused to consummate the marriage, resisting her husband for the first four days. After less than a week with him, she says, his brother and two others held her down while he raped her, and the next day when he tried it again, she stabbed him and fled to her parents, who brought her to the cops.
Sudanese novelist Hamour Zyada wrote on Facebook on Saturday, as part of a campaign tagged #justicefornoura that "Noura is a victim and not a killer".
Ms Hussein was forced into marriage at 16.
"Under Sharia law, the husband's family can demand either monetary compensation or death", Badr Eldin Salah, an activist from the Afrika Youth Movement who was in the court told the agency. She said that while the rape and harassment of women had always been an issue in Sudan, a case like Hussein's had never gone viral.
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The judge asked the deceased man's family which option they wanted, and the family chose execution. Meanwhile, Change.org also launched an online petition on her behalf. Groups such as Equality Now are writing to Sudanese President Omar al-Bashir to plead for clemency.
The judgment has raised concerns over the justice system in Sudan, especially when it comes to marital rape.
Supporters of Hussein flocked to the Criminal Court in Omdurman, Sudan's second-largest city, in protest during the trial. But Hussein's case was different.
Sudan is ranked 165 out of 188 countries on the U.N.'s Gender Inequality Index, which measures how women fare compared to men when it comes to access to health, education, political participation and employment opportunities.
Magango, of Amnesty International, said that by applying the "cruel" death penalty to a rape victim, Sudanese authorities failed to acknowledge the violence Hussein endured.