Nowak, from Chafford Hundred in Essex, was a first-year student at the University of Southampton. He had been walking back to his accommodation after drinking to a level that was below the drink-drive limit, the trial heard.
The prosecution said he was stabbed five times, including twice in the back of his legs, once in the face and a fatal wound to the chest.
Digwa said he carried the blade as part of his Sikh faith, though the Sikh Federation said the blade he used was not a religious knife, known as a kirpan.
A transcript obtained by the BBC recorded in the back of a police van has Digwa admitting to his brother, Gurpreet, that he had stabbed the teenager multiple times.
Digwa, his brother and his father have pleaded not guilty to multiple weapons offence charges.
Protests erupted in Southampton after the police bodycam footage was released.
More than 20 people have so far been sentenced over the disorder, during which 12 police officers and a police dog were injured.
The attorney general’s office has since referred Digwa’s sentence to the Court of Appeal under the unduly lenient sentence scheme. Digwa himself is seeking to appeal against his conviction and sentence.
A full inquest into Henry Nowak’s death is due to be held in Winchester next year.
