Jeremy Bamber, who was convicted of the notorious White House Farm murders, has branded ITV's six part series on the killings 'a disgrace.'
Bamber was locked up for shooting his adoptive parents, half sister and her twin boys in 1985 and handed a sentence of life without parole.
The now 59-year-old has continued to protest his innocence over the years and attempted numerous appeals over his sentence.
His crimes are the subject of ITV series White House Farm, partly based on the research of author Carol Ann Lee in The The Murders at White House Farm.
Lawyers representing Bamber launched a high court challenge to the Crown Prosecution Service (CPS) in December for allegedly failing to disclose evidence that they say would undermine the safety of his conviction.
It's also reported that they wrote to the producers of the ITV series to ask them to postpone the screening until the challenge was resolved.
Speaking to the East Anglian Times from behind bars, Bamber criticised the drama and Ms Lee's book for the portrayal of events.
Asked how he felt about the current series, Bamber told the publication: "The ITV drama is a disgrace.
"It is being broadcast in the middle of a judicial review and is likely to interfere with the CPS being able to pursue the option of a retrial.
"It is promoted as 'a drama' as Carol Ann Lee's book that it's based upon is, for the most part, simply made up."
Bamber has maintained that his sister Sheila was responsible for the multiple shootings before turning the gun on herself as part of a murder-suicide.
After observing the evidence and exchanging regular letters with Bamber to inform her book, author Ms Lee said she was happy to support the ITV dramatisations of the case.
Of Bamber's criticisms, Ms Lee said: "I fully appreciate he'll have an opinion on it, but it's just not true to say it's speculation.
"Everything in the book is meticulously footnoted, there is a very small piece of speculation at the end when I discuss how the murders could have been carried out but I make it very clear that that is the case.
"[The series] is actually very fair to him. It's the story of his conviction and not the story of how he killed his family."
An ITV spokeswoman said: "ITV has a proud record of broadcasting award-winning factual dramas, based on or representing real events and people.
"The same sensitivity, care, consideration, meticulous research and high production values have been applied to White House Farm."
White House Farm continues tonight on ITV at 9pm