The accused are lodged at the central jail at Colvale following their arrest in connection with the incident which took place on the night of January 1.
Jayesh Bhandari, one of the four injured victims, died at Goa Medical College and Hospital yesterday, said inspector Jivba Dalvi.
The tourists, earlier booked for 'attempt to murder', are now facing the charge of murder, he said.
Police would approach the court and seek their custody for further investigation with the murder charge added to the first information report, he said.
Police have also seized the mini-bus in which the accused travelled to Goa.
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