I just read a artical, find a person named 喻东岳, who is the one at 1989 throw something to Mao's picture at Tian-an-men square.
he still stay in the prison. but he is in mental case it was said in the artical.
if so, I hope chinese government can release him as soon as posible. because a mental case person should not stay in prison.
also, actually I think it against law to keep a mental case person in prison.