A total of 28 people were killed, including eight children, and more than 100 were injured when the glass roof of Transvaal Park in southern Moscow collapsed on February 14, 2004. The aqua-park opened in summer 2002.
A 20-month investigation into the case established that Nodar Kancheli, the chief designer in the Transvaal project, and Anatoly Voronin, the head of the Moscow project expert authority, were responsible for the tragedy at the futuristic glass and concrete center.
"The investigation materials prompt the objective conclusion that the partial collapse of the Transvaal Park's roof was caused by a series of design mistakes and grave architectural miscalculations in the building that failed to meet reliability and safety standards," the prosecutors said in their conclusion.
The architect has consistently denied any guilt and suggestions were made at the time of the tragedy that builders might have substituted construction materials for cheaper substances.
Kancheli was also questioned after the roof at a Moscow market he designed collapsed on February 25 this year, killing at least 60 people.
However, despite the evidence, the Transvaal case has been gathering dust ever since it was returned by a court for further investigation on February 6, 2006.
The prosecutor's office decided Monday to close the investigation into Kancheli under an amnesty dedicated to the 100th anniversary of the State Duma, the lower chamber of the Russian parliament.
"Nodar Kancheli's lawyer petitioned the prosecutor's office to stop a criminal investigation against his client due to an amnesty announced by the State Duma in April ," prosecutors said in a statement today.
The statement said Kancheli had agreed to the case being closed on the basis that he would not seek to have his name cleared legally in the future.