Nicky Jacobs, who has always maintained that he was not involved in the killing of PC Blakelock, repeated his innocence on BBC's Newsnight, which airs tonight on BBC Two at 10.30pm.
Mr Jacobs, 45, was jailed in 1986 for throwing petrol bombs at police during the 1985 Broadwater Farm riots.
He was later implicated in murder of PC Blakelock, who was stabbed 43 times as he tried to protect firefighters tackling blazes during the riots.
Mr Jacobs told the programme that rap lyrics relating to the murder that were found in his cell in 1988 were not a confession.
I didn't kill PC Blakelock - I wasn't in that group that heard about firemen at the shop or whatever.
It is just fate on my behalf that turned out to be good. I wrote this rap poem and they're trying to say it is a confession - all that it is, is what was played out in the press - they talk about this baying mob attacking him and all this and trying to chop off his head. All that I just got from the press.
That's why you just see 'we, we' and that are referring to Tottenham. My only thing was saying 'I had one intention and I wiped off my knife'.
Three witnesses told the Old Bailey that they saw Jacobs take part in the attack, but his defence team questioned their credibility.
After deliberating for four hours, the jury returned a not guilty verdict.
More top news
In 1974, Muhammad Ali beat the George Foreman against all odds in the heart of Africa. Our Washington Correspondent looks back at the fight.
Exceptionally mild temperatures for the last day of October.
A town in southern France has banned residents from wearing clown costumes in the street after a wave of 'attacks' across the nation.