Two men will stand trial for the October murder of a prominent transgender rights advocate in Argentina.

According to the Telam news agency, an appeals court has upheld a lower court's ruling which said that Gabriel David Marino and Felix Alberto Ruiz Diaz can be tried for aggravated homicide in connection with the murder of Diana Sacayan.

Sacayan, 40, was found dead in her Buenos Aires apartment. She was the third transgender woman found murdered in the month of October.

According to Amnesty International, Sacayan's body showed signs of violence.

Mariela Belski, executive director of Amnesty International, said of the killings: “A dark cloud has set over Argentina's trans community.”

Telam reported that Sacayan, a prominent civil rights advocate, met Marino while undergoing treatment for drug addiction. Authorities found traces of Marino's biological material in a condom left in Sacayan's apartment bathroom.

In 2012, then-President Cristina Fernandez de Kirchner personally handed Sacayan her national identity card recognizing her as a woman.