Tulegen Imashev, 25, who is among suspects accused of the alleged abduction of two top managers at the country's leading bank Nurbank, also served as an aide to Aliyev at the Kazakh embassy in Austria until May 2007.
"Investigators know that he [Imashev] is abroad, which is why he has been placed on the international wanted list," Bagdad Kozhakhmetov said.
He said Aliyev, the former husband of President Nursultan Nazarbayev's eldest daughter, is wanted in Kazakhstan for allegedly organizing a criminal group that illegally seized plots of land and real estate. He is also accused of abducting two top managers of Nurbank, where he was a co-owner.
The son of a former health minister, Aliyev was fired late May after publicly accusing Kazakhstan's 17-year leader of totalitarian rule. The fugitive businessman also announced he would run against Nazarbayev at elections in 2012.
Aliyev, 44, was arrested in Vienna on June 1 and released on a one-million-euro bail two days later. He is awaiting a ruling over his extradition.
The former ambassador insisted in an interview with Austrian weekly Profil that the charges against him were trumped up on orders from Nazarbayev, and said that if he were extradited, his life would be in danger.
