The partner of a man murdered in a "cowardly act of revenge" says she can never forgive the father and son who "hunted him down" like an animal.

Jesse Thompson, 19, was in the back seat of an SUV when he was fatally shot on the streets of Wyong, on the NSW Central Coast, in 2017.

At the time, the SUV was being pursued at high speed by a ute driven by John Paul Evans, 57, with his son Keith Evans, 31, in the front passenger seat.

The duo were found guilty of Thompson's murder in July after a NSW Supreme Court jury retrial.

The Evans' had stolen Thompson's life and "taken everything" from his family, the victim's partner Hanna Andersen told a sentencing hearing on Tuesday.

"(We) were carelessly and unfairly given the harshest life sentence possible," she said in a statement read t

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