When Ngarbi was apprended by T Hawson on 11 May 1842, between twenty to thirty of his Countrymen threatened Hawson. They did not attempt a rescue. Ngarbi admitted his involvement in the confrontation at McEllister’s station the previous day, and was known to be one of those involved in the murders at Rolles Biddle’s station in March 1842.
(See 'The South Australian Frontier and its Legacies' for more details.)

Ngarbi was found guilty for the murder of Elizabeth Tubbs at Port Lincoln on 29 March 1842. He was hanged at the Adelaide Gaol on 1 August 1843.
(See 'The South Australian Frontier and its Legacies' for more details.)