According to the Syrian Network for Human Rights, there were no charges against al-Amin, and he was a Swedish citizen.
The network determined that he was arrested on 20 October after SDF forces raided his home, without a warrant or informing his family of the reason.
The network also found that his body had severe signs of torture, including fractures to the head and rib cage, while a coroner has indicated he was likely killed in January this year.