Czech fugitive Radovan Krejcir and his five co-accused are expected to be sentenced in the High Court in Johannesburg on Monday.
On August 24, Krejcir was convicted of attempted murder, kidnapping and dealing in drugs.
The matter related to the kidnapping and torture of Bheki Lukhele, whose brother, Doctor, had allegedly disappeared with 25kg of tik.
He has attempted multiple prison escape attempts since his arrest.
The Star newspaper last week reported on an alleged plot by Krejcir to kill high court Judge Colin Lamont.
The paper said Krejcir had apparently hired a European hitman who had allegedly tried to visit Krejcir in Kokstad C-Max in December to hatch a plan for the assassinations, but officials prevented this.
"A top cop had rushed to the Kokstad maximum security facility the following day and demanded all the video footage showing the faces of visitors, claiming he was going to investigate the matter," The Star reported.
Source: News24
Just R20 for the first month. Support independent journalism by subscribing to our digital news package. 