"I didn't know she was going to die," murder accused Jason Wiremu Poihipi sobbed to a detective two days after it's claimed he punched and kicked his pregnant partner to death.

A recording of the DVD interview in which Poihipi said these words was played today to the jury trying him in the High Court at Rotorua.

Poihipi, 19, has denied murdering Lynace Parakuka at Rotorua on September 7 last year. His lawyer clams the 22-year-old's death is a case of manslaughter not murder.

The recorded interview was punctuated with lengthy silences as Poihipi sat with is head in his hands, at times Detective Mahara Alcock had to remind him to move back into camera range.

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Composing himself slightly Poihipi told Alcock he had been walking down Lisa Cres when he saw Parakuka through a lit window having sex with another man.

"I went to another house to get a knife to stab him then I decided not to."

When he next saw Parakuka she was on the corner of Clayton and May Rds, panting.

As he started to walk off she demanded to know what he was doing, accusing him of going to cheat on her. Poihipi said Parakuka had grabbed his hoodie telling him he wasn't going anywhere.

Taking her by the hand he led her into St Michael's school grounds where he accused her of cheating on him.

"She said 'yes'... I was really angry, l punched her four to five times she fell to the ground, when she was getting up I kicked her in the middle of her face."

Asked about the kick Poihipi said it was probably his hardest ... "I was drunk".

He went and sat by a building where he could hear Parakuka breathing heavily "like snoring, when she didn't get up I thought she was joking".

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He walked over to her and realised she wasn't joking, he freaked out when he saw she had a black eye and ran to his uncle's home close by.

There he told is cousin he'd given his "missus" a hiding, his cousin dialled 111 and they returned to where Parakuka lay, she wasn't breathing and his cousin started CPR.

Asked by the detective about seeing his partner having sex with another man, Poihipi responded he didn't know who the man was. "I just seen [sic] them naked on the bed, I was angry, became overwhelmed with jealousy."

He tried to get in a window but it was locked, picking up a rock he threw it on to the roof.

"It must have made them stop because it was a big rock."

Poihipi estimated he and Parakuka had been arguing for about five minutes before he punched and kicked her.

"I didn't know she was going to die," he said through sobs, telling Alcock Parakuka was two months pregnant with his child.

Throughout the time the DVD was being played Poihipi sat in the dock with his head hung low.

Detective Constable Joshua Tapsell was the final Crown witness in its case against Poihipi this afternoon.

Poihipi told Tapsell he had kicked his pregnant partner in the head and that was what killed her, the jury has heard.

After Tapsell's evidence Crown prosecutor Duncan McWilliam closed his case and the defence elected not to give or call evidence.

Tapsell testified about taking Poihipi for a cigarette break while he was being interviewed at the Rotorua police station.

While they were in the smoking area Poihipi expressed his regrets about what had happened to his partner, saying he couldn't believe he had given her a hiding and she'd died.

"He went on to explain how he had seen her with someone else, he had gone back to his uncle's to get a knife but his cousin had intervened," Tapsell told the jury.

Poihipi told him Parakuka must have gone for a walk around the block because he bumped into her near the school.

"He said he struck her four or five times, she fell to the ground and when she tried to get up he kicked her in the head, he said that is what killed her," the detective confirmed.

He outlined how Poihipi told him that as he had held Parakuka in his arms she began to snore, he had thought she was playing games but when she stopped breathing he ran for his cousin.

"He said she had put up with him and that he loved her," Tapsell concluded.

Questioned by defence lawyer Roger Gowing, Tapsell agreed he had known Poihipi since he was a young fella but denied he'd been involved when Poihipi's children had been uplifted from their home by the then CYFS.

Asked who was doing most of the talking in the smoking area Tapsell responded it was Poihipi.

Justice Ian Gault told jurors the trial had made good progress and they would hear closing arguments tomorrow .

The trial is proceeding with 11 jurors after one became unwell overnight and Justice Ian Gault discharged her.