Prosecutors said the killings took place over a drug deal and the case was dramatised in the 2000 film Essex Boys, starring Sean Bean.
Whomes, now 59, was handed a life sentence with a minimum of 25 years before being eligible for parole after being convicted of murdering the trio.
However, he saw his sentence reduced by two years in 2018 after the High Court ruled he had made exceptional progress in jail.
Pat Tate, Tony Tucker and Craig Rolfe, who were found dead in a Range Rover in Rettendon, Essex
- Credit: Essex Police
In the same year, it emerged the Criminal Cases Review Commission (CCRC) was reviewing new evidence related to the case after a fresh appeal was launched.
BBC News
Published
image captionJack Whomes was jailed for life in 1998 for the Essex Boys murders
A triple killer convicted of the notorious Essex Boys farmland murders is to be released from jail.
Jack Whomes, 59, was given a life sentence in 1998 for the execution of three men whose Range Rover had been ambushed in Rettendon in December 1995.
He maintains his innocence and in 2018 saw his minimum term cut from 25 to just over 22 years for exemplary behaviour behind bars.
A Parole Board spokesman confirmed a panel had directed Whomes release.
In one of Britain s most notorious gangland killings, drug smuggler Whomes was convicted of shooting three men in a row over drugs.
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