Appearing before Judge Nicole Noman, 29-year-old Matthew James Williams tendered a letter of apology which expressed remorse for his actions on the night.

He pleaded guilty to the charges of assault with intent, and aggravated sexual assault.

During the sentencing hearing, the court was shown a 12-minute CCTV compilation taken from four separate locations in Jindabyne which clearly showed Williams following the male victim, known to the court as as RD, and the woman, identified only as SM, as they walked together along the busy Kosciuszko Rd.

The assaults took place around 1.30am on the roadside grass verge almost directly opposite Jindabyne's Foreshore Park.

Williams had previously been trying to re-enter Banjo Paterson Inn on Kosciuszko Rd, where the two victims had been drinking with friends.

After apparently following his victims along the road at a distance, the court was told Williams approached RD from behind, punched him until he fell to the ground, and then kicked him into unconsciousness. He then turned on the woman and struck her in the face several times.

The woman screamed and offered the offender money. In response, Williams laughed at her.

When the male victim regained consciousness, he saw the offender straddling the woman and pinning her arms to the ground.

Williams forcibly removed the woman's shirt and bra, bit her breast and aggressively removed her pants.

When RD attempted to intervene, he was again bashed and lost consciousness.

When he came to, he saw the lights of a passing car and ran out to flag it down. The triple-zero emergency call was received at 1.42am.

A photograph displayed to the court of RD after the attack showed his face covered in blood and his eyes swollen shut. He had suffered a broken nose and eye socket, together with bruising to his face and body.

The female victim suffered multiple injuries and bruising to her face, knees, thighs and breast, and had a fingernail torn off. In her victim impact statement, she said "the pain will stay with me forever".

The offender was described by his defence counsel as a man of no previous convictions, of "unblemished character" and who "excelled in his role of ski instructor". Mr Williams had alternated in his ski instruction between Canada and Australia.

While Williams had admitted to being a chronic cannabis user, he had taken a "blue pill" that night which he assumed was valium.

After his arrest he provided a "detailed but false account of his movements that night" in which his watch had been stolen sometime during the evening and when he had struggled to put a ski glove on his swollen hand the following day, had attributed his injuries to a "rough night". His watch was later found at the crime scene.

Williams has been held in the protective area of Goulburn Correctional Centre since his arrest on July 10 last year.