Napier man Kerry Nind has been jailed for multiple assaults on his partner, the mother of his young twin daughters. (File photo)

A prolonged and vicious assault by her partner left a young woman fearing she was going to die.

Kerry Nind, 23, and his partner had been in a relationship for about a year. They had five-week-old twin daughters, and were living in a Napier flat.

On the afternoon of January 2, 2018, the woman told Nind she wanted to go for a short walk as she felt she needed a break from the twins.

Nind prevented her from leaving. They argued and the woman attempted to slap Nind across the face.

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He reacted by shoving her across a doorway and telling her she wasn't going anywhere. He grabbed her by her hair and pulled her around a room and slapped her on the face then told her she wasn't going to leave the room.

While she was on the floor Nind began choking her and squeezed her neck over several minutes, making it difficult for her to breathe.

According to a summary of facts Nind told her she was horrible and that "she had made him like this".

She tried to leave the room several times, but was pulled backwards by her hair and prevented from leaving.

Over the next hour Nind punched and kicked the woman as well as squeezing her neck until she nearly passed out.

STUFF Judge Geoff Rea sentenced Nind in Napier District Court on Tuesday.

At one point Nind pulled her to the bathroom, pushed her head toward the toilet bowl and said "I may as well just kill you".

A short time later she was sitting and crying in the bedroom where the babies were sleeping. Nind walked in, told her to give him petrol vouchers, which she did, then slapped her face several times and punched her repeatedly in the stomach, winding her.

"The complainant felt like she couldn't breathe and fell to the ground," the summary said.

Nind grabbed her by the throat and started choking her again. She started losing consciousness, but was able to snap back Nind's fingers and pry his hands off her throat.

Nind then put his bare foot on her head, held it on the ground and said "I may as well stomp your head in. Why shouldn't I do it?"

"I know I am going back to jail. I'll make it worthwhile this time," he said.

He strangled her again and punched her head with his other hand. As he held her on the ground for several minutes she felt she was going to die.

Later, as she prepared bottles for the babies Nind picked up a full can of baby formula and threw it at her head, causing it to cut and bleed.

"God, you're bleeding. I better not have to take you to the doctors," Nind said to her.

"This is nothing yet... This is how we are going to live now," he said, before slamming her bleeding face into the kitchen bench.

Later, as she fed the babies, Nind left the house. She sought help. The police arrived and arrested Nind a short time later.

He appeared in Napier District Court on Tuesday after pleading guilty to two charges of assault with intent to injure, assault with a weapon, and a representative charge of injuring with intent to injure.

Judge Geoff Rea sentenced Nind to two years' imprisonment, acknowledging that he had made efforts to rehabilitate while held in custody on remand.