The closely watched coroner's inquiry into the death of American researcher Shane Todd resumes on Tuesday.

The court may hear evidence from up to seven witnesses, mainly from the Singapore Police Force and the Health Sciences Authority (HSA), who have been lined up by the state for the second day of the proceedings.

They include police investigation officers, a police photographer, a crime scene specialist from the police Forensic Management Branch, as well as a DNA profiling analyst and a consultant forensic scientist from HSA.

On the first day of proceedings on Monday, the court heard that Dr Todd had searched for suicide- related websites 19 times in the four months before his body was found hanged against a door in his apartment near Chinatown last June.

Evidence presented by Senior State Counsel Tai Wei Shyong, also showed that police officers who were first at the scene, found no signs of a break-in or foul play.

An investigation officer, who arrived at the scene later, also found a document on a laptop on Dr Todd's bed, which appeared to be a suicide note.

His parents, however, had said previously that they believe their son was murdered over his work for the Singapore Institute of Microelectronics, which they said had links to a Chinese firm seen as a security threat by the United States.

The inquiry is set to go on until May 28.