Santiago Omar Riveros, who ran a detention centre, was found guilty of torturing and beating to
death a 15 year old boy. He is also accused of over 40 crimes against humanity involving victims of the era's so-called "disappeared".
Over 100 people are on trial for fomenting protests against the disputed result of Iran's 12 June presidential election. Amnesty International has challenged the Iranian authorities to open up the court to international observers.