"The length of my beard represents every single day that my daughter has been without the love of her life," Chris Andersen said in the NSW Supreme Court on Thursday.

He read out his victim impact statement at the sentence hearing of John Paul Evans, 53, his son Keith Evans, 27, and a woman who cannot be named for legal reasons.

The trio was found guilty of murdering 19-year-old Jesse Thompson who was gunned down in the back seat of a Toyota Kluger following a pursuit on the afternoon of July 3, 2017, through the streets of Wyong, on the NSW Central Coast.

The three offenders were in a dual-cab ute which pursued the other car, following several heated altercations including one at a nearby park that day.

Keith Evans also was found guilty of wounding Jayke Rodgers with intent to cause grievous bodily harm days before the shooting.

Mr Andersen said he found out his soon-to-be son-in-law had been killed when he heard his daughter Hanna screaming in anguish.

"Over the next few hours, the story blew up on the news," he said.

"I even had friends in the US and the UK saying Jesse's murder had made the news there. Jesse always said he wanted to be famous."

His murder had a huge impact on the family as he had always been "just there" for everyone - taking the little ones to the park and helping the older ones with tasks such as shopping.

Ms Andersen said Mr Thompson had been her best friend and the "absolute love of my life".

She was surrounded by things that could trigger her such as "the brand of a car, an ambulance driving by, or simply seeing a father playing in the park with his kids".

For the first 20 years of her life, she was able to feel safe and never in a million years would she have believed that one day her own family would fall victim to such horrific gun violence in Australia.

"When Jesse died so did my sense of security, trust and safety."

When she saw CCTV in court of some of the chase, she was in disbelief at realising the fear and pain Mr Thompson experienced in his last moments of life.

"His life was treated like some sort of game," she said.

"He was hunted down and left to die like he was some kind of animal."

His mother Nicole Thompson said he was not just her son but her best friend.

"He made me laugh when I wanted to cry, he made my life worth living when I wanted to die," she said.

He was always joking and goofing around, would help anyone and was loved by everyone who knew him.

She could not accept he has gone and watched videos to hear his voice, looked for him when she was out and stared at his photos for hours.

Hanna Andersen's mother said Mr Thompson had been a week away from starting a job and had exciting plans for his future when he was murdered.

"It makes me explosive with sickness to my stomach to know that these inhumane beasts will walk amongst innocent civilians after such a cruel, cold and evil act of violence some day," Jay Andersen said.

She saw the pain of loss rip her daughter to pieces.

"And for the first time there was nothing I could do to fix this for her, but hold her and say I love you."

Justice Mark Ierace will sentence the trio at a later date.

Australian Associated Press