The son of a top aide to Mohsen Rezai, a prominent conservative politician, died while in Tehran’s infamous Evin Prison after being swept up in the recent unrest, news websites reported today, in the latest sign of the extent the discord unleashed by the June 12 presidential election has shaken the country’s establishment. Mohsen Ruholamini, a computer science engineer in his 20s, was reportedly arrested during a July 9 protest against Ahmadinejad that also marked the anniversary of a student uprising. His family was informed Tuesday night by telephone that he had died. His father, Abdul-Hossein Ruholamini, was a senior advisor to Rezai, a former Revolutionary Guard commander who ran as a conservative in the election.