The man accused of killing baby Mikara Reti had been playing a PlayStation game intermittently for six days and was 70 per cent through game the evening the five-month-died.

Trent Hapuku, 22, is accused of killing his girlfriend’s baby while in sole charge of him on Tuesday, January 11. He is on trial in the High Court at Napier for manslaughter.

Hapuku occasionally stayed with the baby's mother, Jamie Reti, in a sleepout on her parents' Flaxmere property.

The Crown claims Hapuku caused fatal injuries to Mikara while Ms Reti was bathing and feeding her other son Timoti, 2, in her parents' house.

In a police interview video played to the court this morning Hapuku is shown telling detective constable Brendan Campbell that he often played PlayStation.

He had been playing the game Scarface since the previous Wednesday. He usually played at night but sometimes during the day and he would pause the game and come back to it.

He was trying to clock the game and estimated he was about 70 per cent through it.

Hapuku told Mr Campbell he had given Mikara a bottle then put him in his cot before starting to play the game. Mikara slept for about an hour, he said, then woke up suddenly crying.

He said he paused the game, picked Mikara up, rubbed his back to burp him and tried to get him back to sleep.

Mikara vomited over his back so he put the baby on a bed. He said Mikara’s feet and hands were cold but his head was warm.

He said he could feel Mikara’s heartbeat and could tell he was breathing.

Ms Reti returned to the sleepout to find him holding Mikara, he said, and became worried at the baby’s appearance.

She "freaked out" he said. They both decided to go to Hapuku’s mother’s house but on the way Mikara appeared worse and they decided to go to the hospital.

Mikara was pronounce dead shortly after they arrived at hospital.

Earlier today the court heard that immediately after Mikara was pronounced dead Hapuku had said police would want to talk to him.

Emergency department nurse Hannah Fitzsimmons said Mikara was pale and cold when brought into the hospital at about 8pm.

Ms Fitzsmmons and other staff spent 10-12 minutes trying to resuscitate Mikara but he showed no sign of life.

Staff and Mikara, Ms Reti and Hapuku moved to a private room after he died.

Ms Fitzsimmons said Hapuku slid to the floor against a wall, his face in his hands.

He then stood up and said "something like the police will want to talk to me because I was the last to see baby alive," Ms Fitzsimmons said.

Another nurse, Nichola Robertson, recalled Hapuku saying "I’m going to get in trouble for this" and "I was the last one to see the baby alive".

Ms Robertson also recalled an older woman arriving in the room, walking up to Hapuku and asking him "what have you done?".

Ms Reti, now 23, was four months pregnant to Hapuku at the time of Mikara’s death and gave birth to their child in July. The pair had been together since September 2010.

The court was shown hospital CCTV of the four arriving at the hospital, Hapuku carrying Mikara wrapped in the blanket.

Yesterday triage nurse Susan Elliott said she became concerned about Hapuku holding Mikara in the hospital waiting area because Hapuku looked "shifty".

A blanket around Mikara was covering his face. When she removed the blanket Mikara looked "deathly white" Ms Elliott said.

She took Mikara and dashed to the resuscitation area, attempting to give him mouth to mouth as she went.

She said Hapuku told her he had fed Mikara then put him down. When Mikara screamed he picked him up and then Mikara vomited.

Yesterday the court also heard from head of Hawke’s Bay Hospital’s emergency department Dr Craig Ellis.

Dr Ellis said the injuries inflicted on Mikara’s liver were consistent with those suffered by babies dropped by a great height or involved in a high speed car crash.

Dr Ellis said resuscitation was attempted on Mikara shortly after he was brought to hospital by his mother Jamie Reti and Hapuku at 7.50pm.

Dr Ellis said Mikara was "stony cold", his pupils were unreactive and he showed signs of having been dead for 20-30 minutes.

"I was advised the child had been alive in the car and the waiting room. I do not believe that was correct," Dr Ellis said.

The trial is expected to finish tomorrow or Friday.