The killers of have been jailed for a total of 57 years.
Steven Donaldson's body was discovered in the car park at Kinnordy Nature Reserve near Kirriemuir, Angus, in the early hours of June 7 last year.
Murderers Steven Dickie and Callum Davidson were given life sentences with a minimum term of 23 and 24 years respectively, for the brutal murder following a trial at the High Court in Edinburgh.
The pair were convicted of murdering the offshore worker earlier this month.
Ex-girlfriend Tasmin Glass was sentenced to 10 years behind bars after she was convicted of culpable homicide.
Oil worker Steven, 27, from Arbroath, was lured to a playpark on June 6 last year by ex-girlfriend Tasmin Glass.
He was attacked there by Callum Davidson and Steven Dickie, then driven a nature reserve where he was killed with a heavy, bladed weapon. His body was later set alight.
The trio were found guilty at a trial on May 3.
Passing sentence, Judge Lord Pentland said Dickie and Davidson had used "extreme violence" in their attack on Mr Donaldson and that the assault was "sustained and prolonged".
He described the victim as a "loved and admired" young man who had established a career.
"He had many years of life to look forward to," the judge said.
Lord Pentland told Dickie and Davidson: "You cut him down without mercy."
He added: "What I am left with is a clear picture demonstrating you are both cold-blooded, violent and unrepentant."
