 Piskun has been fired from the office of Prosecutor General by two presidents of Ukraine, Leonid Kuchma and Viktor Yushchenko, but both dismissals were voided by the courts.Since late October 2011 former Prime Minister Yulia Tymoshenko has also been implicated, particularly by the First Deputy Prosecutor General of Ukraine Renat Kuzmin.Since late October 2011 Ukrainian prosecutors are investigating whether Tymoshenko and Lazarenko were involved in the murder of Shcherban.