At about 11 pm on 17 February 2010 the offender went to the family home. An argument developed between him and his wife. Ms Tram [Mr Kien's wife] asked the offender to leave the home but he did not do so. Ms Tram asked her third child to assist her in having the offender leave the home. As it happened, the offender and the child left the home together and they went to the offender's home, where they stayed overnight.
On the morning of 18 February the offender took his child to his child's school. As it happened, at about the same time Ms Tram took her youngest child to the child's school, leaving her two eldest children at the home. After she had returned to the home, Ms Tram saw the offender come inside the home and she asked him to leave but he did not do so. An argument developed between Ms Tram and the offender, during which she pinched him with a pair of tweezers, then she raised a chair as if to throw it at him or to strike him with it, and then, after the chair was taken from her, she picked up the telephone handset to call police.
On Ms Tram raising the chair and looking as if she would throw it at him or strike him with it, the offender struggled with Ms Tram over the chair, eventually taking the chair from her and suffering injury to the fingers of his right hand. The injuries to the offender's right hand can be seen in the photographs numbered 26, 31, 32 and 33 in Exhibit G. Then, after taking the chair from her, the offender took the telephone handset from Ms Tram and dropped it onto the floor.
When she bent down to pick up the telephone handset, the offender picked up the chair and struck Ms Tram with it at least three times, breaking the chair into its component pieces. The pieces of the broken chair can be seen in the photographs numbered 124, 126, 127, 133, 135, 136, 137, 138 and 139 in Exhibit B.
With Ms Tram lying on the floor of her bedroom, the offender went into the en-suite bathroom attached to the bedroom to wash the blood from his hands. On the offender leaving the bedroom, Ms Tram got to her feet and, notwithstanding bleeding profusely from her wounds, ran out from the bedroom towards the front door of the home, but the offender chased her and he caught her near to the front door.
On catching her near to the front door, the offender placed his hands about Ms Tram's neck and he choked her, rendering her unconscious and causing her to fall to the ground. The place near to the front door where the offender caught Ms Tram and chocked her can be seen in photographs numbered 62, 63, 64, 78 and 101 in Exhibit C.
After choking her into unconsciousness, the offender left Ms Tram lying on the floor near to the front door and he went into Ms Tram's bedroom, from where he obtained a pink scarf or towel and then he returned to Ms Tram, lying, as she was, on the floor, and he tied the scarf or towel around her neck, knotting the ends of it together.
Fortunately for his mother, the eldest child of the offender and Ms Tram, having heard the commotion, went out of his bedroom to see what had happened. He saw his mother lying on her back on the floor surrounded by blood with a scarf or towel tied around her neck and knotted and he saw his father sitting on the floor next to his mother. He went up to his mother and untied the knot of the scarf or towel which was around her neck. Then he went to his first brother's room and told his brother to telephone for police and ambulance then he returned to his mother and father.
The second child of Ms Tram and the offender telephoned 000 to request police and ambulance and he relayed instructions to his older brother as to what he had to do to their mother pending the arrival of the ambulance.
At about 9.40 am on 18 February 2010 police arrived at the home of Ms Tram. After ascertaining that Ms Tram had a pulse, police spoke to the offender. Then an ambulance arrived at the home and Ms Tram was treated by paramedics and then taken in the ambulance, driven by one of the police officers, to the Canberra Hospital, whilst the paramedics attended to the treatment of Ms Tram.