Justice Cameron Mander explained to the jury today the reasons for the trial ending early and why Amohanga was not present in the court this morning.
He said following the conclusion of the evidence of Ann Shirley Johnston - mother of the victim and Crown's only eyewitness - on Monday afternoon, Amohanga indicated he was reconsidering his position.
On Tuesday, Amohanga's defence lawyer Bill Dawkins and Crown prosecutor Mary-Jane Thomas had a lengthy discussion in chambers following a further development.
Following the new information, the Crown dropped the main charge of attempted murder.
Justice Mander told the jury the Crown indicated it was willing to add another charge of wounding with intent to cause grievous bodily harm, which carried the same maximum penalty as the other one.
The case was still set to go ahead but at 4.30pm, Justice Mander was advised Amohanga changed his position and was willing to plead guilty.
Amohanga returned to court and pleaded guilty to the charges of wounding with intent to cause grievous bodily harm, threatening to kill, assault and unlawful possession of a firearm.
Justice Mander explained the plea process would normally happen in front of the jury, but did not in this case as Amohanga was "oscillating" whether he would plea or not.
Amohanga will be sentenced on May 4.