For the first time yesterday, Chinese national Wang Zhijian, 45, took the witness stand in his murder trial.
As he answered the prosecution's questions, he revealed what was going on in his troubled mind.
Wang is accused of murdering Madam Zhang Meng, 42, her daughter from her first marriage, Feng Jianyu, 17, and their co-tenant Madam Yang Jie, 36, sometime between 11pm on Sept 18 and 12.49am on Sept 19, 2008.
A fourth charge of attempting to murder Grace (not her real name), Madam Yang's daughter, has been stood down.
Grace, who was 15 at the time of the attack, survived.
According to the statement recorded by the police, Madam Zhang entered Wang's bedroom around 9pm on Sept 18, 2008.They had an argument about his financial status.
He told her that he had spent all his money on her and her daughter. She called him a "poor fellow".
Wang told the court he had replied with something to the effect of: "You are inhumane."
He claimed she went on to belittle, humiliate and criticise him.
It made him angry but he didn't dare to talk back as he was afraid that she would beat or bite him, like she did when they fought previously.
He said: "I was so angry that I was trembling and in a daze. I couldn't move or speak."
Exhaling heavily and shaking his head, Wang told the court through an interpreter: "I am very uncomfortable when thinking about these events."