More than 60 potential witnesses are listed to take part in the coroner's inquest into the death of electronics engineer Shane Todd, who was found hanged in June 2012 in his Singapore apartment as he was preparing to return to the United States.
Huawei Technologies, a Chinese telecom giant seen by Washington as a security threat, and Todd's former employer, Singapore's state-linked Institute of Microelectronics (IME), deny collaborating on any project involving Todd.
They have not accused anyone in particular of responsibility for his death.
"We believe our son was murdered. We know our son was murdered," Mary Todd, 57, a church pastor, told AFP after arriving last week with her husband, an airline pilot, to testify at the inquest.
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Under Singapore law, a coroner's inquest is a fact-finding process to determine the cause of death in suspected suicides and other forms of "unnatural" death, with police findings forming part of the evidence.
The inquiry is scheduled to last until May 28, after which a verdict on the cause of death is expected in three to four weeks.
The case gained world attention when the London-based Financial Times reported in February that Todd, 31, was working on a project using gallium nitride (GaN), a semiconductor material that can be used in radar and satellite communications.
The newspaper quoted Todd's mother as saying that the researcher -- who had a history of depression -- "felt he was being asked to compromise American security" at the IME in his dealings with "a Chinese company".