Watch: 'Your actions have devastated my life' - mother of Renee Duckmanton issues powerful victim impact statement

The mother of murdered Christchurch sex worker Renee Duckmanton has delivered an emotional victim impact statement to her daughter's killer, speaking of the all-consuming misery his actions have inflicted on her daily life.

Tracey Duckmanton was one of several family members who agreed to be filmed while speaking in court today before Sainey Marong's sentencing to life imprisonment.

"Look at me Sainey," Ms Duckmanton said as she began to personally address the guilty man.

"You listen to this, you, you came into her life, and your actions devestated my life and my families life. Nothing will ever be the same.

"I have to wake up every morning knowing I will never see my beautiful daughter ever again, and have to live with what you did to her.

"I can't have fun anymore without feeling guilty. Life will never be the same.

"We are here today to hear the sentence the court will impose but I want you to know nothing, no sentence, no punishment will ever be enough.

"I hope you rot in hell. Thank you for listening to me."

Sainey Marong strangled 22-year-old Duckmanton before burning her body, and today was put in prison for a minimum of 18 years. Source: 1 NEWS

Sainey Marong was found guilty in February, after a High Court at Christchurch jury deliberated for just 50 minutes.

The 33-year-old Gambian-born butcher strangled the 22-year-old Duckmanton after picking her up from Christchurch's Manchester Street in May 2016.

He then dumped her body on a Rakaia roadside, and set it on fire. He claimed he was insane at the time, but it took a jury just 50 minutes to find him guilty.

Renee Duckmanton.
Renee Duckmanton. Source: Supplied

In sentencing today Justice Cameron Mander described the killing as "premeditated, cold blooded," and that Marong has shown no remorse or insight for his actions.

"It is an inescapable conclusion your murder was the culmination of a depraved need to abduct a sex worker and kill her. On this night you carried through with a crime you had been contemplating for some time."

After the judge delivered the sentence the family, who filled the public gallery applauded and thanked the judge.

Others had to be retrained from rushing towards the killer as he was taken down shouting: "Rot in there you maggot".

Tracey Duckmanton has confronted her daughter's killer in court on his sentencing. Source: 1 NEWS