This was announced by Communications Department of the Prosecutor General's Office of Ukraine, Censor.NET reports.
PGO says it gathered enough evidence to prove the guilt of the persons in questions.
However, at the final stage of the pre-trial investigation, the intermediary in the crime was suddenly taken to a psychiatric hospital of Zhytomyr without any diagnosis.
"Since then, Hrechkovskyi's accomplice has been 'traveling' from one hospital to another and stating he has defamed Hrechkovskyi due to his alleged psychiatric illness," the message reads.
PGO says the court has ruled to conduct a psychiatric check-up of Hrechkovskyi's accomplice. The agency believes such behavior 'is an attempt to avoid criminal liability.'
The Pechersk district court of Kyiv rejected arrest of Hrechkovskyi on Sept. 22, 2016. He was released under 3.85 million hryvnia bail ($137,500). PGO suspects Hrechkovskyi of extortion of a $500,000 bribe.