The trial of the five men charged with gang raping and brutalising a 23-year-old medical student in the national capital on December 16 will formally begin on Tuesday.
Reports said the prosecution has called four witnesses including the software engineer man, who was with the victim and had tried to save her.
Before she died on December 29 at a Singapore hospital, the victim had recorded her statement. That would be crucial evidence in the case.
On Saturday, the five pleaded not guilty to the charges read out to them. They could face death penalty, if convicted.
The sixth accused, a juvenile, is being tried by juvenile justice board. He faces a maximum punishment of three years in a reform facility. Police has said he was the most brutal among the assaulters.