The man found dead in the back seat of a car submerged in the Usine/Ste Madeleine reservoir on Monday has been identified as 25-year-old Richard Beharry.
Beharry, of Green Acres, San Fernando, was shot once in the head.
Police have no motive for the killing.
Investigators were told that residents heard a gunshot at around 10p.m on Sunday.
The vehicle was discovered by a couple who had gone to the reservoir to retrieve a fish pot which they had left overnight.
They called the police.
Fire fighters went into the water and found the body of a man in the back seat.
The vehicle was pulled from the water and crime scene officers searched the vehicle.
They found that a brick had been lodged against the accelerator pedal to keep it depressed.