A police officer has won £50,000 libel damages from a writer who claimed the Yorkshire Ripper hoaxer was framed.
Mr Gregg sued in the High Court
Det Ch Supt Chris Gregg, of West Yorkshire Police, was accused by Noel O'Gara of "stitching up" John Humble - known as Wearside Jack.
Humble, 52, was jailed in 2006 after admitting sending hoax letters and a tape saying he was the 1970s killer.
His actions made police concentrate their hunt in Sunderland while Peter Sutcliffe carried on killing.
Mr O'Gara, of Athlone, County Westmeath, in Ireland, alleged that Mr Gregg had improperly interrogated Humble for two days while Humble was drunk, tampered with DNA evidence and blackmailed him into pleading guilty.
Humble, known as Wearside Jack, was trapped by DNA on an envelope
He also claimed that the real Ripper was a man who used to work for him in Ireland and was still at large, and it was he who sent the letters and tape.
The allegations were made in four publications on the internet, in an email and in a letter.
Mr Justice King, sitting at London's High Court on Monday, said Mr O'Gara had conducted a "persistent campaign of vilification" against the senior police officer.
He entered summary judgment against Mr O'Gara, the author of a book entitled The Real Yorkshire Ripper, on the basis that he had no real prospect of defending the case.
Justice King said: "I have no doubt that these were extremely serious libels on a senior serving police officer.
"They allege serious misconduct in bringing about the conviction of an innocent man, and were wholly false".
O'Gara was also ordered to pay £10,000 court costs.
Humble, of Flodden Road, Sunderland, was jailed for eight years after admitting four charges of perverting the course of justice in connection to three hoax letters and an audio tape.