Hundreds of documents related to the death of New Zealander Blair Peach are to be made public this week.
Mr Peach was knocked unconscious during an anti-racism demonstration in London on 23 April 1979 and died the following day.
An inquest jury returned a verdict of death by misadventure in 1980. However, numerous witnesses reported seeing Mr Peach being struck by one or more members of the Metropolitan Police Special Patrol Group.
Six officers were suspected of assaulting Mr Peach, but no-one was charged over the assault.
It is understood a decision has been made that no charges will be laid, clearing the way for the documents to be released.
Among them are several reports and reviews concluding that the blow which killed Mr Peach was likely to have been struck by an on-duty police officer.
